初一数学计算题及答案
初一数学计算题及
答案
1.25 X( 8+10) = 1.25 X 8+1.25 X 10
= 10+12.5=22.5
9123- (123+8.8 )
=9123-123-8.8
=9000-8.8
=8991.2
1.24 X 8.3+8.3 X 1.76
=8.3 X( 1.24+1.76)
=8.3 X 3=24.9
9999X1001
=9999X( 1000+1)
=9999X 1000+9999X 1
=10008999
14.8 X 6.3-6.3 X 6.5 + 8.3 X 3.7 =(14.8-6.5 ) X 6.3 + 8.3 X 3.7 =8.3 X 6.3+8.3 X 3.7
8.3 X( 6.3 + 3.7 )
=8.3 X 10
=83
1.24+0.78+8.76
=(1.24+8.76 ) +0.78
= 10+0.78
= 10.78
933-157-43
=933- (157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
I32 X 125X 25
=4X 8X 125X 25
=(4X 25)X( 8X 125)
=100X1000
=100000
9048- 268
=(2600+2600+2600+1248 - 26
=2600- 26+2600- 26+2600- 26+1248- 269 =100+100+100+48
=348
2881 - 43
=(1290+1591)- 434
= 1290- 43+1591 十43
=30+37
3.2 X 42.3 X 3.75-12.5 X 0.423 X 16
=3.2 X 42.3 X 3.75-1.25 X 42.3 X 1.6
=42.3 X (3.2 X 3.75-1.25 X 1.6)
=42.3 X (4 X 0.8 X 3.75-1.25 X4X 0.4)
=42.3 X (4 X 0.4 X 2X 3.75-1.25 X4X 0.4) =42.3 X (4x0.4x7.5-1.25x4x0.4)
=42.3 X [4 X 0.4 X (7.5-1.25)]
=42.3 X [4 X 0.4 X 6.25]
=42.3 X (4 X 2.5)
=4237
1.8+18 - 1.5-0.5 X 0.3
= 1.8+12-0.15
= 13.8-0.15
= 13.65
6.5 X 8+3.5 X 8-47
=52+28-47
=80-47
(80-9.8) X 5 分之2-1.32
=70.2X2/5-1.32
=28.08-1.32
=26.76
8X 7 分之4-[1 - (3.2-2.95)] =8X 4/7 - [1 - 0.25]
=8X4/7 - 4
=8/7
2700X( 506-499)- 900
=2700X 7 - 900
= 18900- 900
=21
33.02 -( 148.4 —90.85 ) - 2.5 =33.02 —57.55 - 2.5
=33.02 —23.02
=10
(1- 1 —1)- 5.1
=(1—1)- 5.1
=0-5.1
=0
18.1 +( 3 —0.299 - 0.23 ) X 1 = 18.1 + 1.7 X 1
= 18.1 + 1.7
= 19.8
卜18]+29+卜52]+60= 19
[-3]+[-2]+[-1]+0+1+2二-3
卜301]+125+301+卜75]= 50
[-1]+[-1/2]+3/4+[-1/4]= -1
[-7/2]+5/6+[-0.5]+4/5+19/6二 1.25 [-26.54]+[-6.14]+18.54+6.14二-8
1.125+[-17/5]+[-1/8]+[-0.6]= -3
[-98+76+(-87)]*23[56+(-75)-(7)]-(8+4+3) 5+21*8/2-6-59
68/21-8-11*8+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4*(-0.4)]/1/3+2
22+(-4)+(-2)+4*3
-2*8-8*1/2+8/1/8
(2/3+1/2)/(-1/12)*(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)*(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
1/2*(-4/15)/2/3
-3x+2y-5x-7y
1437X 27+ 27X 563 〔75- (12+18)〕- 15
2160-〔( 83-79) X 18〕280 + 840- 24 X 5
325- 13X (266 —250) 85 X (95 —1440-24)
58870-(105 + 20X 2) 1437 X 27+ 27 X 563
81432-(13 X 52+ 78) [37.85- (7.85+6.4 ) ] X 30
156X [(17.7-7.2) - 3] (947—599) + 76X 64
36 X (913 —276-23) [192 —( 54+ 38) ] X 67
[(7.1-5.6 ) X 0.9-1.15] - 2.5 81432 - (13 X 52+ 78)
5.4 -[2.6 X(3.7-2.9 )+0.62] (947 —599) + 76X64 60—(9.5 + 28.9)]
-0.18 2.881 - 0.43 —0.24 X 3.5 20 X [(2.44 —1.8) - 0.4 + 0.15]
28-(3.4 1.25 X 2.4) 0.8 X〔15.5-(3.21 5.79) 〕(31.8 3.2 X 4)
5 194—64.8 - 1.8 X 0.9 36.72 - 4.25 X 9.9 3.41
6 -( 0.016 X 35) 0.8
X [(10 —6.76) - 1.2]
(136+64)X( 65-345 - 23) (6.8-6.8 X 0.55) - 8.5
0.12 X 4.8 - 0.12 X 4.8 ( 58+37)-( 64-9 X 5)
812-700 -( 9+31X 11) ( 3.2 X 1.5+2.5 ) - 1.6
85+14X( 14+208- 26) 120-36 X 4 - 18+35
(284+16)X( 512-8208 - 18) 9.72 X 1.6-18.305 - 7
4/7 - [1/3 X( 3/5-3/10 ) ] (4/5+1/4 )- 7/3+7/10
12.78 —0 -( 13.4 + 156.6 ) 37.812-700 -( 9+31X 11) (136+64)
X( 65-345 - 23) 3.2 X( 1.5+2.5 ) - 1.6
85+14X( 14+208- 26) ( 58+37)十(64-9 X 5)
(6.8-6.8 X 0.55) - 8.5 (284+16)X( 512-8208 - 18)
0.12 X 4.8 - 0.12 X 4.8 ( 3.2 X 1.5+2.5 ) - 1.6
120-36 X 4- 18+35 10.15-10.75 X 0.4-5.7
5.8 X( 3.87-0.13 ) +4.2 X 3.74 347+45 X 2-4160 - 52
32.52- (6+9.728 - 3.2 ) X 2.5 87 ( 58+37)-( 64-9 X 5) [(7.1-5.6 ) X 0.9-1.15] - 2.5 ( 3.2 X 1.5+2.5 ) - 1.6
5.4 - [2.6 X( 3.7-2.9 ) +0.62] 12 X 6-( 12-7.2 ) -6
3.2 X 6+ (1.5+2.5 ) - 1.6 (3.2 X 1.5+2.5 ) - 1.6
5.8 X( 3.87-0.13 ) +4.2 X 3.74
33.02 —( 148.4 —90.85) - 2.5
1)23+(-73)
(2) (-84)+(-49)
(3) 7+(-2.04)
(4) 4.23+(-7.57)
(5) (-7/3)+(-7/6)
(6) 9/4+(-3/2)
(7) 3.75+(2.25)+5/4
(8) -3.75+(+5/4)+(-1.5)
(9) (-17/4)+(-10/3)+(+13/3)+(11/3)
(10) (-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)