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新人教版七年级数学期末纠错训练、易错题整理
新人教版七年级数学期末纠错训练、易错题整理

新人教版七年级数学纠错训练题

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同学们:要改变过去“只要一错,总是常错”而应该“只要一错,抓住攻破,不能再错”,

下面题目正确吗?如果不正确请改之.

1) y x -的相反数是y x --.

2) 最小的整数是0.

3) 若字母a 表示有理数,则a>-a .

4) a 与-a 一定不相等.

5)

4-的倒数等于14

6) 已知105=-x ,求x 的值. 因为105=-x ,所以15=x .

7) “比x 的相反数大3的数”可表示为:一(x+3) .

8) “,a b 两数的平方和”可表示为: 2()a b +.

9) 2.10×4

10有2个有效数字v

10) 2.4万有5个有效数字.

11) 用科学记数法表示的数560043(保留三个有效数字).解:原式=560×310.

12) 抛掷两枚均匀硬币,硬币落地后,朝上一面只可能有以下三种情况:

(1)全是正面;(2)一正一反;(3)全是反面,因此这三个事件发生的可能性相等的.

13) 二元一次方程3x y +=的一个解可表示为2, 1.x y ==

14) 单项式34q -

的系数为3.

15) 单项式2

2a bc 的次数为2次.

16) 多项式2x 2一y +1的项分别是2x 2

y 和1.

17) 多项式2x 2一y +1的次数为3次.

18) 有一个外角为锐角的三角形为锐角

三角形。

19) 在镜子里看到 实际是

20) 线段和角都不是轴对称图形。

21) 面积相等的两个三角形全等。

22) 方程13xy +=是二元一次方程.

23) 33339.=?=

24) 23235--=+=

25) 111236-

+=

26) )34()43(6-?-÷616)]34()43[(6=÷=-?-÷.

27) 8(27)3÷-÷=8(9)÷-=89-

28) 431(2)773+?-=)3

12()7374(-?+ =3

12-.

29) )6523(15+-÷=315()152÷-+÷56

10188=-+=

30) (一1)2007= 一2007.

31) 22(4)4-=-=16.

32) 22224()339

==.

33) 5一32=22=4.

34) 2×32 =62=36.

35) 5×2

)53(=32=9.

36) 33339.=?=

37) )15(120)4()25.6(-÷--?-

解:原式=25-8=17.

38) 已知a=-3,求6一a 的值.

解:当a=-3,原式=6一3=3.

39) 已知a=3,求6一a 的值.

解:当a=-3,原式=6一3=3.

40) 求整式3 x+4y 与2 x -2y 的差。

解:3 x+4y -2 x -2y=3 x -2 x+4y -2y= x+2 y

41) 解方程53+=x x 解:25525353=====-=+=x x x x x x

42) 解方程:13625+=-x x .

解:移项,得21365-=+x x ,合并同类项,得1111=x ,系数化为1,得1=x .

43) 解方程16

3242=--+x x 解:去分母,得1)32(2)2(3=--+x x ,整理,得11-=-x ,∴11=x .

44) 解方程:63x =- 解:x=-2

45) 325a b ab +=

46) 235a a a +=

47) 22523y y -=

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