初中常用立方,平方根,立方根表
平方根立方立方根
√0 = 0(表示根号0等于0,下同)√1 = 1
√2 = 1.414
√3 = 1.732
√4 = 2
√5 = 2.236
√6 = 2.449
√7 = 2.646
√8 = 2.828
√9 = 3
√10 = 3.162
√11 = 3.317
√12 = 3.464
√13 = 3.606
√14 = 3.742
√15 = 3.873
√16 = 4
√17 = 4.123
√18 = 4.243
√19 = 4.359
√20 = 4.472
√21 = 4.583
√22 = 4.690
√23 = 4.796
√24 = 4.899
√25 = 5
√26 = 5.099
√27 = 5.196
√28 = 5.292
√29 = 5.385
√30 = 5.477
√31 = 5.568
√32 = 5.657
√33 = 5.745
√34 = 5.831
√35 = 5.916
√36 = 6
√37 = 6.083
√38 = 6.164
√39 = 6.245
√40 = 6.325
√41 = 6.403
√42 = 6.481
√43 = 6.557
√44 = 6.633
√45 = 6.708
√46 = 6.782
√47 = 6.856
√48 = 6.928
√49 = 7 √50 = 7.071
√51 = 7.141
√52 = 7.211
√53 = 7.280
√54 = 7.348
√55 = 7.416
√56 = 7.483
√57 = 7.550
√58 = 7.616
√59 = 7.681
√60 = 7.746
√61 = 7.810
√62 = 7.874
√63 = 7.937
√64 = 8
√65 = 8.062
√66 = 8.124
√67 = 8.185
√68 = 8.246
√69 = 8.307
√70 = 8.367
√71 = 8.426
√72 = 8.485
√73 = 8.544
√74 = 8.602
√75 = 8.660
√76 = 8.718
√77 = 8.775
√78 = 8.832
√79 = 8.888
√80 = 8.944
√81 = 9
√82 = 9.055
√83 = 9.110
√84 = 9.165
√85 = 9.220
√86 = 9.274
√87 = 9.327
√88 = 9.381
√89 = 9.434
√90 = 9.487
√91 = 9.539
√92 = 9.592
√93 = 9.644
√94 = 9.695
√95 = 9.747
√96 = 9.798
√97 = 9.849
√98 = 9.900
√99 = 9.950
√100 = 10
1^3=1
2^3=8
3^3=27
4^3=64
5^3=125
6^3=216
7^3=343
8^3=512
9^3=729
10^3=1000
11^3=1331
12^3=1728
13^3=2197
14^3=2744
15^3=3375
16^3=4096
17^3=4913
18^3=5832
19^3=6859
20^3=8000
21^3=9261
22^3=10648
23^3=12167
24^3=13824
25^3=15625
26^3=17576
27^3=19683
28^3=21952
29^3=24389
30^3=27000
31^3=29791
32^3=32768
33^3=35937
34^3=39304
35^3=42875
36^3=46656
37^3=50653
38^3=54872
39^3=59319
40^3=64000
41^3=68921
42^3=74088
43^3=79507
44^3=85184
45^3=91125
46^3=97336
47^3=103823
48^3=110592
49^3=117649
50^3=125000
51^3=132651
52^3=140608
53^3=148877
54^3=157464
55^3=166375
56^3=175616
57^3=185193
58^3=195112
59^3=205379
60^3=216000
61^3=226981
62^3=238328
63^3=250047
64^3=262144
65^3=274625
66^3=287496
67^3=300763
68^3=314432
69^3=328509
70^3=343000
71^3=357911
72^3=373248
73^3=389017
74^3=405224
75^3=421875
76^3=438976
77^3=456533
78^3=474552
79^3=493039
80^3=512000
81^3=531441
82^3=551368
83^3=571787
84^3=592704
85^3=614125
86^3=636056
87^3=658503
88^3=681472
89^3=704969
90^3=729000
91^3=753571
92^3=778688
93^3=804357
94^3=830584
95^3=857375
96^3=884736
97^3=912673
98^3=941192
99^3=970299
100^3=1000000
3√0 = 0
3√1 = 1
3√2 = 1.260
3√3 = 1.442
3√4 = 1.587
3√5 = 1.710
3√6 = 1.817
3√7 = 1.913
3√8 = 2
3√9 = 2.080
3√10 = 2.154
3√11 = 2.224
3√12 = 2.289
3√13 = 2.351
3√14 = 2.410
3√15 = 2.466
3√16 = 2.520
3√17 = 2.571
3√18 = 2.621
3√19 = 2.668
3√20 = 2.714
3√21 = 2.759
3√22 = 2.802
3√23 = 2.844
3√24 = 2.884
3√25 = 2.924
3√26 = 2.962
3√27 = 3
3√28 = 3.037
3√29 = 3.072
3√30 = 3.107
3√31 = 3.141
3√32 = 3.175
3√33 = 3.206
3√34 = 3.240
3√35 = 3.271
3√36 = 3.302
3√37 = 3.332
3√38 = 3.362
3√39 = 3.391
3√40 = 3.420
3√41 = 3.448
3√42 = 3.476
3√43 = 3.503
3√44 = 3.530
3√45 = 3.557
3√46 = 3.583
3√47 = 3.609
3√48 = 3.634
3√49 = 3.659
3√50 = 3.684
3√51 = 3.708
3√52 = 3.733
3√53 = 3.756
3√54 = 3.780
3√55 = 3.803
3√56 = 3.826
3√57 = 3.849
3√58 = 3.871
3√59 = 3.893
3√60 = 3.915
3√61 = 3.936
3√62 = 3.958
3√63 = 3.979
3√64 = 4
3√65 = 4.021
3√66 = 4.041
3√67 = 4.062
3√68 = 4.082
3√69 = 4.102
3√70 = 4.121
3√71 = 4.141
3√72 = 4.160
3√73 = 4.179
3√74 = 4.198
3√75 = 4.217
3√76 = 4.236
3√77 = 4.254
3√78 = 4.273
3√79 = 4.291
3√80 = 4.309
3√81 = 4.327
3√82 = 4.344
3√83 = 4.362
3√84 = 4.380
3√85 = 4.397
3√86 = 4.414
3√87 = 4.431
3√88 = 4.448
3√89 = 4.465
3√90 = 4.481
3√91 = 4.498
3√92 = 4.514
3√93 = 4.531
3√94 = 4.547
3√95 = 4.563
3√96 = 4.579
3√97 = 4.595
3√98 = 4.610
3√99 = 4.626
3√100 = 4.642
初中常用立方-平方根-立方根表
平方根立方立方根 √1 = 1 √2 = 1.414√3 = 1.732√4 = 2 √5 = 2.236√6 = 2.449 √7 = 2.646 √8 = 2.828√9 = 3 √10 = 3.162√11 = 3.317 √12 = 3.464 √13 = 3.606 √14 = 3.742 √15 = 3.873 √16 = 4 √17 = 4.123 √18 = 4.243 √19 = 4.359 √20 = 4.472 √21 = 4.583 √22 = 4.690 √23 = 4.796 √24 = 4.899 √25 = 5 √26 = 5.099 √27 = 5.196 √28 = 5.292 √29 = 5.385 √30 = 5.477 √31 = 5.568 √32 = 5.657 √33 = 5.745 √34 = 5.831 √35 = 5.916√36 = 6 √37 = 6.083 √38 = 6.164√39 = 6.245 √40 = 6.325 √41 = 6.403√42 = 6.481 √43 = 6.557√44 = 6.633 √45 = 6.708√46 = 6.782√47 = 6.856 √48 = 6.928 √49 = 7 √50 = 7.071 √51 = 7.141 √52 = 7.211 √53 = 7.280 √54 = 7.348 √55 = 7.416 √56 = 7.483 √57 = 7.550 √58 = 7.616 √59 = 7.681 √60 = 7.746 √61 = 7.810 √62 = 7.874 √63 = 7.937 √64 = 8 √65 = 8.062 √66 = 8.124 √67 = 8.185 √68 = 8.246 √69 = 8.307 √70 = 8.367 √71 = 8.426 √72 = 8.485 √73 = 8.544 √74 = 8.602 √75 = 8.660 √76 = 8.718 √77 = 8.775 √78 = 8.832 √79 = 8.888 √80 = 8.944 √81 = 9 √82 = 9.055 √83 = 9.110 √84 = 9.165 √85 = 9.220 √86 = 9.274 √87 = 9.327 √88 = 9.381 √89 = 9.434 √90 = 9.487 √91 = 9.539 √92 = 9.592 √93 = 9.644 √94 = 9.695 √95 = 9.747 √96 = 9.798 √97 = 9.849 √98 = 9.900 √99 = 9.950 √100 = 10 1^3=1 2^3=8 3^3=27 4^3=64 5^3=125 6^3=216 7^3=343 8^3=512 9^3=729 10^3=1000 11^3=1331 12^3=1728 13^3=2197 14^3=2744 15^3=3375 16^3=4096 17^3=4913 18^3=5832 19^3=6859 20^3=8000 21^3=9261 22^3=10648 23^3=12167 24^3=13824 25^3=15625 26^3=17576 27^3=19683 28^3=21952 29^3=24389 30^3=27000 31^3=29791 32^3=32768 33^3=35937 34^3=39304 35^3=42875 36^3=46656 37^3=50653 38^3=54872 39^3=59319 40^3=64000 41^3=68921 42^3=74088 43^3=79507 44^3=85184 45^3=91125 46^3=97336 47^3=103823 48^3=110592 49^3=117649 50^3=125000 51^3=132651 52^3=140608 53^3=148877 54^3=157464 55^3=166375 56^3=175616 57^3=185193 58^3=195112 59^3=205379 60^3=216000 61^3=226981 62^3=238328 63^3=250047 64^3=262144 65^3=274625 66^3=287496 67^3=300763 68^3=314432 69^3=328509 70^3=343000 71^3=357911 72^3=373248 73^3=389017 74^3=405224 75^3=421875 76^3=438976 77^3=456533 78^3=474552 79^3=493039 80^3=512000 81^3=531441 82^3=551368 83^3=571787 84^3=592704 85^3=614125 86^3=636056 87^3=658503 88^3=681472 89^3=704969 90^3=729000 91^3=753571 92^3=778688 93^3=804357 94^3=830584 95^3=857375 96^3=884736 97^3=912673 98^3=941192 99^3=970299 100^3=1000000 3√0 = 0 3√1 = 1 3√2 = 1.260 3√3 = 1.442 3√4 = 1.587 3√5 = 1.710 3√6 = 1.817 3√7 = 1.913 3√8 = 2 3√9 = 2.080 3√10 = 2.154 3√11 = 2.224 3√12 = 2.289 3√13 = 2.351 3√14 = 2.410 3√15 = 2.466 3√16 = 2.520 3√17 = 2.571 3√18 = 2.621 3√19 = 2.668 3√20 = 2.714 3√21 = 2.759 3√22 = 2.802 3√23 = 2.844 3√24 = 2.884 3√25 = 2.924 3√26 = 2.962 3√27 = 3 3√28 = 3.037 3√29 = 3.072 3√30 = 3.107 3√31 = 3.141 3√32 = 3.175 3√33 = 3.206 3√34 = 3.240 3√35 = 3.271 3√36 = 3.302 3√37 = 3.332 3√38 = 3.362 3√39 = 3.391 3√40 = 3.420 3√41 = 3.448 3√42 = 3.476 3√43 = 3.503 3√44 = 3.530 3√45 = 3.557 3√46 = 3.583 3√47 = 3.609 3√48 = 3.634 3√49 = 3.659 3√50 = 3.684 3√51 = 3.708 3√52 = 3.733 3√53 = 3.756 3√54 = 3.780 3√55 = 3.803 3√56 = 3.826 3√57 = 3.849 3√58 = 3.871 3√59 = 3.893 3√60 = 3.915 3√61 = 3.936 3√62 = 3.958 3√63 = 3.979 3√64 = 4 3√65 = 4.021 3√66 = 4.041 3√67 = 4.062 3√68 = 4.082 3√69 = 4.102 3√70 = 4.121 3√71 = 4.141 3√72 = 4.160 3√73 = 4.179 3√74 = 4.198 3√75 = 4.217 3√76 = 4.236 3√77 = 4.254 3√78 = 4.273 3√79 = 4.291 3√80 = 4.309 3√81 = 4.327 3√82 = 4.344 3√83 = 4.362 3√84 = 4.380
1---50-平方表、立方表、平方根表、立方根表98872
1*1=1 2*2=4 3*3=9 4*4=16 5*5=25 6*6=36 7*7=49 8*8=64 9*9=81 10*10=100》 11*11=121 12*12=144 13*13=16914*14=196 15*15=225 16*16=256 17*17=289 18*18=324 19*19=361 ( 20*20=400 21*21=441 22*22=484 23*23=529 24*24=576 25*25=625 26*26=676 27*27=729 28*28=784 29*29=841 : 30*30=900 31*31=961 32*32=1024 33*33=1089 34*34=1156 35*35=1225 36*36=1296 37*37=1369 38*38=1444 39*39=1521 $ 40*40=1600 41*41=1681 42*42=1764 43*43=1849 44*44=1936 45*45=2025 46*46=2116 47*47=2209 48*48=2304 49*49=2401 ^ 50*50=2500 1 ----- 50平方根 √0 = 0(表示根号0等于0,下同) √1 = 1 √2 = √3 = √4 = 2 √5 = √6 = √7 = √8 = √9 = 3 √10 = √11 = √12 = √13 = √14 = √15 = √16 = 4 √17 = √18 = √19 = √20 = √21 = √22 = √23 = √24 = √25 = 5 √26 = √27 = √28 = √29 = √30 = √31 = √32 = √33 = √34 = √35 = √36 = 6 √37 = √38 = √ 39 = √40 = √41 = √42 = √43 = √44 = √45 = √46 = √47 = √48 = √49 = 7
数学用表 平方根
数学用表平方根 √0 = 0 √1 = 1 √2 = 1.41421 √3 = 1.73205 √4 = 2 √5 = 2.23606√6 = 2.44948 √7 = 2.64575√8 = 2.82842 √9 = 3 √10 = 3.16227 √11 = 3.31662√12 = 3.46410 √13 = 3.60555√14 = 3.74165 √15 = 3.87298√16 = 4 √17 = 4.12310√18 = 4.24264 √19 = 4.35889√20 = 4.47213 √21 = 4.58257√22 = 4.69041 √23 = 4.79583√24 = 4.89897 √25 = 5 √26 = 5.09901 √27 = 5.19615 √28 = 5.29150 √29 = 5.38516√30 = 5.47722 √31 = 5.56776√32 = 5.65685 √33 = 5.74456√34 = 5.83095 √35 = 5.91607
√38 = 6.16441 √39 = 6.24499√40 = 6.32455 √41 = 6.40312√42 = 6.48074 √43 = 6.55743√44 = 6.63324 √45 = 6.70820√46 = 6.78232 √47 = 6.85565√48 = 6.92820 √49 = 7 √50 = 7.07106 √51 = 7.14142 √52 = 7.21110 √53 = 7.28010√54 = 7.34846 √55 = 7.41619√56 = 7.48331 √57 = 7.54983√58 = 7.61577 √59 = 7.68114√60 = 7.74596 √61 = 7.81024√62 = 7.87400 √63 = 7.93725√64 = 8 √65 = 8.06225√66 = 8.12403 √67 = 8.18535√68 = 8.24621 √69 = 8.30662√70 = 8.36660 √71 = 8.42614√72 = 8.48528 √73 = 8.5440√74 = 8.60232 √75 = 8.66025
初中常用立方_平方根_立方根表
平方 根 立方立方根 52^3=140608 53^3=148877 54^3=157464 55^3=166375 56^3=175616 57^3=185193 58^3=195112 59^3=205379 60^3=216000 61^3=226981 62^3=238328 63^3=250047 64^3=262144 65^3=274625 66^3=287496 67^3=300763 68^3=314432 69^3=328509 70^3=343000 71^3=357911 72^3=373248 73^3=389017 74^3=405224 75^3=421875 76^3=438976 77^3=456533 78^3=474552 79^3=493039 80^3=512000 81^3=531441 82^3=551368 83^3=571787 84^3=592704 85^3=614125 86^3=636056 87^3=658503 88^3=681472 89^3=704969 90^3=729000 91^3=753571 92^3=778688 93^3=804357 94^3=830584 95^3=857375 96^3=884736 97^3=912673 98^3=941192 99^3=970299 100^3=1000000 3√0 = 0 3√1 = 1 3√2 = 1.260 3√3 = 1.442 3√4 = 1.587 3√5 = 1.710 3√6 = 1.817 3√7 = 1.913 3√8 = 2 3√9 = 2.080 3√10 = 2.154 3√11 = 2.224 3√12 = 2.289 3√13 = 2.351 3√14 = 2.410 3√15 = 2.466 3√16 = 2.520 3√17 = 2.571 3√18 = 2.621 3√19 = 2.668 3√20 = 2.714 3√21 = 2.759 3√22 = 2.802 3√23 = 2.844 3√24 = 2.884 3√25 = 2.924 3√26 = 2.962 3√27 = 3 3√28 = 3.037 3√29 = 3.072 3√30 = 3.107 3√31 = 3.141 3√32 = 3.175 3√33 = 3.206 3√34 = 3.240 3√35 = 3.271 3√36 = 3.302 3√37 = 3.332 3√38 = 3.362 3√39 = 3.391 3√40 = 3.420 3√41 = 3.448 3√42 = 3.476 3√43 = 3.503 3√44 = 3.530 3√45 = 3.557 3√46 = 3.583 3√47 = 3.609 3√48 = 3.634 3√49 = 3.659 3√50 = 3.684 3√51 = 3.708 3√52 = 3.733 3√53 = 3.756 3√54 = 3.780 3√55 = 3.803 3√56 = 3.826 3√57 = 3.849 3√58 = 3.871 3√59 = 3.893 3√60 = 3.915 3√61 = 3.936 3√62 = 3.958 3√63 = 3.979 3√64 = 4 3√65 = 4.021 3√66 = 4.041 3√67 = 4.062 3√68 = 4.082 3√69 = 4.102 3√70 = 4.121 3√71 = 4.141 3√72 = 4.160 3√73 = 4.179 3√74 = 4.198 3√75 = 4.217 3√76 = 4.236 3√77 = 4.254 3√78 = 4.273 3√79 = 4.291 3√80 = 4.309 3√81 = 4.327 3√82 = 4.344 3√83 = 4.362 3√84 = 4.380 3√85 = 4.397 3√86 = 4.414 3√87 = 4.431 3√88 = 4.448 3√89 = 4.465 3√90 = 4.481 3√91 = 4.498 3√92 = 4.514 3√93 = 4.531 3√94 = 4.547 3√95 = 4.563 3√96 = 4.579 3√97 = 4.595 3√98 = 4.610 3√99 = 4.626 3√100 = 4.642
1---50-平方表、立方表、平方根表、立方根表
For personal use only in study and research; not for commercial use 1*1=1 2*2=4 3*3=9 4*4=16 5*5=25 6*6=36 7*7=49 8*8=64 39*39=1521 40*40=1600 41*41=1681 42*42=1764 43*43=1849 44*44=1936 45*45=2025 46*46=2116 47*47=2209 48*48=2304 49*49=2401 50*50=2500 1 ----- 50平方根 √0 = 0(表示根号0等于0,下同) √1 = 1 √2 = 1.23731 √3 = 1.756888 √4 = 2 √5 = 2.749979 √6 = 2.278318 √7 = 2.106459 √8 = 2.474619 √9 = 3 √10 = 3.016838 √11 = 3.03554 √12 = 3.464 √13 = 3.546399 √14 = 3.677394 √15 = 3.620742 √16 = 4 √17 = 4.123 √18 = 4.711928 √19 = 4.354067 √20 = 4.472 √21 = 4.495584 √22 = 4.982343 √23 = 4.331272 √24 = 4.556636 √25 = 5 √26 = 5.059278 √27 = 5.196 √28 = 5.212918 √29 = 5.71345 √30 = 5.505166 √31 = 5.283002 √32 = 5.949238 √33 = 5.653803 √34 = 5.48453 √35 = 5.309962 √36 = 6 √37 = 6.029822 √38 = 6.296898 √39 = 6.83984 √40 = 6.033676 √41 = 6.403 √42 = 6.840786 √43 = 6.4302 √44 = 6.07108 √45 = 6.249937 √46 = 6.312527
平 方 根 表(一)
平方根表(一) 一、教学目标 1.使学生了解平方根表的构造。 2.使学生会查平方根表求一个数的平方根,并会利用这个表求表外数的平方根。 3.使学生通过一些简单的查表及近似计算,提高类比思维及运算能力。 4.使学生通过利用平方根表求表外数的平方根的近似值的训练,进一步领会转化与化归的思想。 二、教学重点和难点 1.使学生了解平方根表的构造,了解通过平方根表所能直接查到的数的平方根的范围。 2.使学生清楚被开方数小数点位置的变化与相应的算术平方根小数点位置的变化的关系,从而通过移动小数点的位置来实现用平方根表查表以外的数的平方根,这既是本节内容的重点,也是本节内容的难点。 三、教学过程 由上一节的知识,我们知道,,,我们看到16、9、36的算术平方根为有理数,但我们也发现并非所有的有理数的平方根都是一个有理数,例如2的平方根,我们并不知道什么数的平方等于2,所以对于式子的值,我们只能求得它的任何精 确度的近似值,如何求其近似值呢?由上节的内容,我们已经学到了平方与开平方运算是一为逆运算的。我们看下面的计算: 由此我们看到是一个在1.414和1.415之间的数,将上述运算继续下去,便可以 得以更为精确的的近似值。用这咱方法我们可以求得像、等这样式子的近似值, 但显然这种方法十分麻烦,在实际解题过程中不易使用。为了迅速求得一个数的平方根,我们一起来了解一下平方根表的结构,并学习如何利用这个表查得一些数的平方根。 我们先看表的左上角标有“N”,“N”所在的直列中的数是指被开方数的前两位数,“N”所在的横行中的数是被开方数的第三位数,表最右边的数叫做修正值。表中间最头
部分,是所求数的算术平方根,由四位有效数字的数构成它的第四位一般是四舍五入得到的。由此我们可以清楚《平方根表》查得的平方根也是近似值,但我们在写结果时,仍用等号表示。 这个表中列出了从1.00至99.9的三个数位的数的算述平方根及其修正值,从中可以查到从1.000至99.99有四个有效数字的数的算术平方根的近似值。我们下面就来具体看看如何查一个数的平方根。 例1 查表求、的值。 解:我们先在“N”的直列中找到1.3,再在“N”的横列中找到5,1.3所在横行与5 所在直列的交叉处得到1.162,这就是1.35的算术平方根。∴。 再看,虽然13.5与1.35有效数字相同,但由于小数点位置不同,查表时所取得的横行就不同。所以在查的值时,应先在“N”的直列中找到13.再从“N”所在横 行中找到5,13所在横行与5所在直列的相交处是3.764,∴。 这两个小题,可以看到对于三个有效数字的数,关键看小数点的位置,再决定在“N”所在的直列中找哪一个数值。另外就是在找横行与竖列交叉点时,要对齐,不可看串行或 列,而造成结果错误,下面做书上练习:练习1、2。 练习1.(1);(2); (3);(4); (5);(6); (7);(8)。 在做(1)(6)小题时,让学生注意对比,可让学生上黑板作。 练习2。查表求下列各式的值: (1); (2); (3); 在做这三道小题时,由于被开方数为整数,学生在“N”所在直列中找到数后,在“N”的横行中不知应找何数,这时应告诉学生应在“N”的横列中找0,因为2、60、95均可看作2.0、60.0、95.0。 (4); 此题,提醒学生先查表求的值,再添上负号即可。 (5);
平方根表及算法
近期看张开川的那个Ruby学习文档的7.2节的知识就从网上查询了一下,分享上来 好久没用到过平方根之类的了,其实平方根算法也不怎么复杂的。 (武汉火麒麟) ================================== 平方根97计算方法一: 我们用a来表示A的平方根,方程x-a=0的解就为A的平方根a。两边平方后有:x*x-2ax+A=0,因为x不等于0,两边除以x有: x-2a+A/x=0、a=(x+A/x)/2 所以你只需设置一个约等于(x+A/x)/2的初始值,代入上面公式,可以得到一个更加近似的值。再将它代入,又可以得到一个更加精确的值……依此方法,最后得到一个足够精度的(x+A/x)/2的值即为A的平方根值。 真的是这样吗?假设我们代入的值x﹤a 由于这里考虑a﹥0故:x*x﹤a*a 即x ﹤A/x (x+A/x)/2﹥(x+x)/2 即(x+A/x)/2>x 即当代入的x﹤a时(x+A/x)/2的值将比x大。 同样可以证明当代入的x﹥a时(x+A/x)/2的值将比x小。这样随着计算次数的增加,(x+A/x)/2的值就越来越接近a的值了。 如:计算sqrt(5) 设初值为x = 2 第一次计算:(2+5/2)/2=2.25 第二次计算:(2.25+5/2.25)/2=2.236111 第三次计算:(2.236111+5/2.236111)/2=2.236068 这三步所得的结果和5 的平方根值相差已经小于0.001 了。 计算方法二: 我们可以使用二分法来计算平方根。
设f(x)=x*x - A 同样设置a为A的平方根,哪么a就是f(x)=0的根。 你可以先找两个正值m,n使f(m)<0,f(n)>0 根据函数的单调性,a就在区间(m,n)间。 然后计算(m+n)/2,计算f((m+n)/2),如果它大于零,那么a就在区间(m,(m+n)/2)之间。 小于零,就在((m+n)/2,n)之间,如果等于零,那么(m+n)/2当然就是a。这样重复几次,你可以把a存在的范围一步步缩小,在最后足够精确的区间内随便取一个值,它就约等于a。 计算方法三: 以上的方法都不是很直接,在上世纪80年代的初中数学书上,都还在介绍一种比较直接的计算方法: (1)如求54756的算术平方根时先由个位向左两位两位地定位:定位为5,47,56,接着象一般除法那样列出除式. (2)先从最高位用最大平方数试商:最大平方数不超过5的是2,得商后,除式5-4后得1。把商2写上除式上。 (3)加上下一位的数:得147。 (4)用20去乘商后去试商147:2×20=40 这40可试商为3,那就把试商的3加上4 0去除147。得147÷43=3,把3写上除式上。这时147-129=18。 (5)加上下一位的数:得1856。 (6)用20去乘商后去试商1856:23×20=460 这460可试商为4,那就把试商的4加到460去除1856。得4,把4写上除式上。这时1856-1856=0,无余数啦。 (7)这时除式上的商是234,即是54756的平方根。 哪么这种计算方法是怎么得来的呢?查找了好久都没有找到答案。静下心来仔细分平方根的计算过程,后来的步骤都有20乘以也有的商再加上预计的商乘上预计的商。设也有的商为a预计的商为b就是(20*a+b)*b即20ab+b*b。而实质上预计的商是平方根中已有的商的后一位数字,平方根实际为10a+b再乘以10的N次方(N为整数),这里我们可以简化为平方根为10a+b(因为乘10的N次方只影响平方的小数点位置,对数字计算没有影响)。
平方根立方根表
平 √0 = 0(表示根号0等于0,下同) √1 = 1 √2 = 1.4142135623731 √3 = 1.73205080756888 √4 = 2 √5 = 2.23606797749979 √6 = 2.44948974278318 √7 = 2.64575131106459 √8 = 2.82842712474619 √9 = 3 √10 = 3.16227766016838 √11 = 3.3166247903554 √12 = 3.46410161513775 √13 = 3.60555127546399 √14 = 3.74165738677394 √15 = 3.87298334620742 √16 = 4 √17 = 4.12310562561766 √18 = 4.24264068711928 √19 = 4.35889894354067 √20 = 4.47213595499958 √21 = 4.58257569495584 √22 = 4.69041575982343 √23 = 4.79583152331272 √24 = 4.89897948556636 √25 = 5 √26 = 5.09901951359278 √27 = 5.19615242270663 √28 = 5.29150262212918 √29 = 5.3851648071345 √30 = 5.47722557505166 √31 = 5.56776436283002 √32 = 5.65685424949238 √33 = 5.74456264653803 √34 = 5.8309518948453 √35 = 5.91607978309962 √36 = 6 方根 √37 = 6.08276253029822 √38 = 6.16441400296898 √39 = 6.2449979983984 √40 = 6.32455532033676 √41 = 6.40312423743285 √42 = 6.48074069840786 √43 = 6.557438524302 √44 = 6.6332495807108 √45 = 6.70820393249937 √46 = 6.78232998312527 √47 = 6.85565460040104 √48 = 6.92820323027551 √49 = 7 √50 = 7.07106781186548 √51 = 7.14142842854285 √52 = 7.21110255092798 √53 = 7.28010988928052 √54 = 7.34846922834953 √55 = 7.41619848709566 √56 = 7.48331477354788 √57 = 7.54983443527075 √58 = 7.61577310586391 √59 = 7.68114574786861 √60 = 7.74596669241483 √61 = 7.81024967590665 √62 = 7.87400787401181 √63 = 7.93725393319377 √64 = 8 √65 = 8.06225774829855 √66 = 8.12403840463596 √67 = 8.18535277187245 √68 = 8.24621125123532 √69 = 8.30662386291807 √70 = 8.36660026534076 √71 = 8.42614977317636 √72 = 8.48528137423857 √73 = 8.54400374531753 √74 = 8.60232526704263 √75 = 8.66025403784439 表 √76 = 8.71779788708135 √77 = 8.77496438739212 √78 = 8.83176086632785 √79 = 8.88819441731559 √80 = 8.94427190999916 √81 = 9 √82 = 9.05538513813742 √83 = 9.1104335791443 √84 = 9.16515138991168 √85 = 9.21954445729289 √86 = 9.2736184954957 √87 = 9.32737905308882 √88 = 9.38083151964686 √89 = 9.4339811320566 √90 = 9.48683298050514 √91 = 9.53939201416946 √92 = 9.59166304662544 √93 = 9.64365076099295 √94 = 9.69535971483266 √95 = 9.74679434480896 √96 = 9.79795897113271 √97 = 9.8488578017961 √98 = 9.89949493661167 √99 = 9.9498743710662 √100 = 10 √101 = 10.0498756211209 √102 = 10.0995049383621 √103 = 10.1488915650922 √104 = 10.1980390271856 √105 = 10.2469507659596 √106 = 10.295630140987 √107 = 10.3440804327886 √108 = 10.3923048454133 √109 = 10.4403065089106 √110 = 10.4880884817015 √111 = 10.5356537528527 √112 = 10.5830052442584 √113 = 10.6301458127347 √114 = 10.6770782520313
数学平方根开方表
数学平方根开方表 √0 = 0(表示根号0等于0,下同)√1 = 1 √2 = 1.4142135623731 √3 = 1.73205080756888 √4 = 2 √5 = 2.23606797749979 √6 = 2.44948974278318 √7 = 2.64575131106459 √8 = 2.82842712474619 √9 = 3 √10 = 3.16227766016838 √11 = 3.3166247903554 √12 = 3.46410161513775 √13 = 3.60555127546399 √14 = 3.74165738677394 √15 = 3.87298334620742 √16 = 4 √17 = 4.12310562561766 √18 = 4.24264068711928 √19 = 4.35889894354067 √20 = 4.47213595499958 √21 = 4.58257569495584 √22 = 4.69041575982343 √23 = 4.79583152331272 √24 = 4.89897948556636 √25 = 5 √26 = 5.09901951359278 √27 = 5.19615242270663 √28 = 5.29150262212918 √29 = 5.3851648071345 √30 = 5.47722557505166 √31 = 5.56776436283002 √32 = 5.65685424949238 √33 = 5.74456264653803 √34 = 5.8309518948453 √35 = 5.91607978309962 √36 = 6 √37 = 6.08276253029822 √38 = 6.16441400296898 √39 = 6.2449979983984
初二数学平方根表
平方根表√0 = 0(表示根号0等于0,下同)√1 = 1 √2 = 1.414 √3 = 1.73205080756888 √4 = 2 √5 = 2.236 √6 = 2.44948974278318 √7 = 2.646 √8 = 2.82842712474619 √9 = 3 √10 = 3.16227766016838 √11 = 3.3166247903554 √12 = 3.46410161513775 √13 = 3.60555127546399 √14 = 3.74165738677394 √15 = 3.87298334620742 √16 = 4 √17 = 4.12310562561766 √18 = 4.24264068711928 √19 = 4.35889894354067 √20 = 4.47213595499958 √21 = 4.58257569495584 √22 = 4.69041575982343 √23 = 4.79583152331272 √24 = 4.89897948556636 √25 = 5 √26 = 5.09901951359278 √27 = 5.19615242270663 √28 = 5.29150262212918 √29 = 5.3851648071345 √30 = 5.47722557505166 √31 = 5.56776436283002 √32 = 5.65685424949238 √33 = 5.74456264653803
√34 = 5.8309518948453√35 = 5.91607978309962√36 = 6 √37 = 6.08276253029822√38 = 6.16441400296898√39 = 6.2449979983984√40 = 6.32455532033676√41 = 6.40312423743285√42 = 6.48074069840786√43 = 6.557438524302√44 = 6.6332495807108√45 = 6.70820393249937√46 = 6.78232998312527√47 = 6.85565460040104√48 = 6.92820323027551√49 = 7 √50 = 7.07106781186548√51 = 7.14142842854285√52 = 7.21110255092798√53 = 7.28010988928052√54 = 7.34846922834953√55 = 7.41619848709566√56 = 7.48331477354788√57 = 7.54983443527075√58 = 7.61577310586391√59 = 7.68114574786861√60 = 7.74596669241483√61 = 7.81024967590665√62 = 7.87400787401181√63 = 7.93725393319377√64 = 8 √65 = 8.06225774829855√66 = 8.12403840463596√67 = 8.18535277187245√68 = 8.24621125123532√69 = 8.30662386291807
数字的平方、立方、平方根表
数字的平方、立方、平方根表 (总1页) -CAL-FENGHAI.-(YICAI)-Company One1 -CAL-本页仅作为文档封面,使用请直接删除
1——50的平方表 1*1=1 2*2=4 3*3=9 4*4=16 5*5=25 6*6=36 7*7=49 8*8=64 9*9=81 10*10=10011*11=121 12*12=144 13*13=169 14*14=196 15*15=225 16*16=256 17*17=289 18*18=324 19*19=361 20*20=400 21*21=441 22*22=484 23*23=529 24*24=576 25*25=625 26*26=676 27*27=729 28*28=784 29*29=841 30*30=900 31*31=961 32*32=1024 33*33=1089 34*34=1156 35*35=1225 36*36=1296 37*37=1369 38*38=1444 39*39=1521 40*40=1600 41*41=1681 42*42=1764 43*43=1849 44*44=1936 45*45=2025 46*46=2116 47*47=2209 48*48=2304 49*49=2401 50*50=2500 1 ——20 的立方表 1*1*1=1 2*2*2=8 3*3*3=27 4*4*4=64 5*5*5=1256*6*6=216 7*7*7=343 8*8*8=512 9*9*9=729 10*10*10=1000 11*11*11=1331 12*12*12=1728 13*13*13=2197 14*14*14=2744 15*15*15=3375 16*16*16=4096 17*17*17=4913 18*18*18=5832 19*19*19=6859 20*20*20=8000底数为2、3、4、5、6的多次方 0----10的平方根 √0 = 0(表示根号0等于0,下同) √1 = 1√2 = 1.4142135623731 √3 = 1.73205080756888 √4 = 2 √5 = 2.23606797749979 √6 = 2.44948974278318 √7 = 2.64575131106459 √8 = 2.82842712474619 √9 = 3 √10 = 3.16227766016838
初中常用立方_平方根_立方根表
平方根立方立方根 √0 = 0(表示根号0等于0,下同)√1 = 1 √2 = 1.414 √3 = 1.732 √4 = 2 √5 = 2.236 √6 = 2.449 √7 = 2.646 √8 = 2.828 √9 = 3 √10 = 3.162 √11 = 3.317 √12 = 3.464 √13 = 3.606 √14 = 3.742 √15 = 3.873 √16 = 4 √17 = 4.123 √18 = 4.243 √19 = 4.359 √20 = 4.472 √21 = 4.583 √22 = 4.690 √23 = 4.796 √24 = 4.899 √25 = 5 √26 = 5.099 √27 = 5.196 √28 = 5.292 √29 = 5.385 √30 = 5.477 √31 = 5.568 √32 = 5.657 √33 = 5.745 √34 = 5.831 √35 = 5.916 √36 = 6 √37 = 6.083 √38 = 6.164 √39 = 6.245 √40 = 6.325 √41 = 6.403 √42 = 6.481 √43 = 6.557 √44 = 6.633 √45 = 6.708 √46 = 6.782 √47 = 6.856 √48 = 6.928 √49 = 7 √50 = 7.071 √51 = 7.141 √52 = 7.211 √53 = 7.280 √54 = 7.348 √55 = 7.416 √56 = 7.483 √57 = 7.550 √58 = 7.616 √59 = 7.681 √60 = 7.746 √61 = 7.810 √62 = 7.874 √63 = 7.937 √64 = 8 √65 = 8.062 √66 = 8.124 √67 = 8.185 √68 = 8.246 √69 = 8.307 √70 = 8.367 √71 = 8.426 √72 = 8.485 √73 = 8.544 √74 = 8.602 √75 = 8.660 √76 = 8.718 √77 = 8.775 √78 = 8.832 √79 = 8.888 √80 = 8.944 √81 = 9 √82 = 9.055 √83 = 9.110 √84 = 9.165 √85 = 9.220 √86 = 9.274 √87 = 9.327 √88 = 9.381 √89 = 9.434 √90 = 9.487 √91 = 9.539 √92 = 9.592 √93 = 9.644 √94 = 9.695 √95 = 9.747 √96 = 9.798 √97 = 9.849 √98 = 9.900 √99 = 9.950 √100 = 10 1^3=1 2^3=8 3^3=27 4^3=64 5^3=125 6^3=216 7^3=343 8^3=512 9^3=729 10^3=1000 11^3=1331 12^3=1728 13^3=2197 14^3=2744 15^3=3375 16^3=4096 17^3=4913 18^3=5832 19^3=6859 20^3=8000 21^3=9261 22^3=10648 23^3=12167 24^3=13824 25^3=15625 26^3=17576 27^3=19683 28^3=21952 29^3=24389 30^3=27000 31^3=29791 32^3=32768 33^3=35937 34^3=39304 35^3=42875 36^3=46656 37^3=50653 38^3=54872 39^3=59319 40^3=64000 41^3=68921 42^3=74088 43^3=79507 44^3=85184 45^3=91125 46^3=97336 47^3=103823 48^3=110592 49^3=117649 50^3=125000 51^3=132651 52^3=140608 53^3=148877 54^3=157464 55^3=166375 56^3=175616 57^3=185193 58^3=195112 59^3=205379 60^3=216000 61^3=226981 62^3=238328 63^3=250047 64^3=262144 65^3=274625 66^3=287496 67^3=300763 68^3=314432 69^3=328509 70^3=343000 71^3=357911 72^3=373248 73^3=389017 74^3=405224 75^3=421875 76^3=438976 77^3=456533 78^3=474552 79^3=493039 80^3=512000 81^3=531441 82^3=551368 83^3=571787 84^3=592704 85^3=614125 86^3=636056 87^3=658503 88^3=681472 89^3=704969 90^3=729000 91^3=753571 92^3=778688 93^3=804357 94^3=830584 95^3=857375 96^3=884736 97^3=912673 98^3=941192 99^3=970299 100^3=1000000 3√0 = 0 3√1 = 1 3√2 = 1.260 3√3 = 1.442 3√4 = 1.587 3√5 = 1.710 3√6 = 1.817 3√7 = 1.913 3√8 = 2 3√9 = 2.080 3√10 = 2.154 3√11 = 2.224 3√12 = 2.289 3√13 = 2.351 3√14 = 2.410 3√15 = 2.466 3√16 = 2.520 3√17 = 2.571 3√18 = 2.621 3√19 = 2.668 3√20 = 2.714 3√21 = 2.759 3√22 = 2.802 3√23 = 2.844 3√24 = 2.884 3√25 = 2.924 3√26 = 2.962 3√27 = 3 3√28 = 3.037 3√29 = 3.072 3√30 = 3.107 3√31 = 3.141 3√32 = 3.175 3√33 = 3.206 3√34 = 3.240 3√35 = 3.271 3√36 = 3.302 3√37 = 3.332 3√38 = 3.362 3√39 = 3.391 3√40 = 3.420 3√41 = 3.448 3√42 = 3.476 3√43 = 3.503 3√44 = 3.530 3√45 = 3.557 3√46 = 3.583 3√47 = 3.609 3√48 = 3.634 3√49 = 3.659 3√50 = 3.684 3√51 = 3.708 3√52 = 3.733 3√53 = 3.756 3√54 = 3.780 3√55 = 3.803 3√56 = 3.826 3√57 = 3.849 3√58 = 3.871 3√59 = 3.893 3√60 = 3.915 3√61 = 3.936 3√62 = 3.958 3√63 = 3.979 3√64 = 4 3√65 = 4.021 3√66 = 4.041 3√67 = 4.062 3√68 = 4.082 3√69 = 4.102 3√70 = 4.121 3√71 = 4.141 3√72 = 4.160 3√73 = 4.179 3√74 = 4.198 3√75 = 4.217 3√76 = 4.236 3√77 = 4.254 3√78 = 4.273 3√79 = 4.291 3√80 = 4.309 3√81 = 4.327 3√82 = 4.344 3√83 = 4.362 3√84 = 4.380 3√85 = 4.397 3√86 = 4.414 3√87 = 4.431 3√88 = 4.448 3√89 = 4.465 3√90 = 4.481 3√91 = 4.498 3√92 = 4.514 3√93 = 4.531 3√94 = 4.547 3√95 = 4.563 3√96 = 4.579 3√97 = 4.595 3√98 = 4.610 3√99 = 4.626 3√100 = 4.642