北师大版七年级下册数学幂的乘方与积的乘方练习题(最新整理)

如果2 3 ,2 6 ,2 12 , 那么a 、b 的关系是 3 ⑶ y 3, y [a-b ） b-a (6)若 4﹒8 ﹒16 ＝2

1、计算：

G7（下）数学幂的乘方与积的乘方巩固练习题

3 3 2 5 3

4 2 （1) (10 ) (2) -(a ) (3) (x ) · x

2 3 2 2 2 4 2 3 (4) [(-x ) ]

(5) (-a ) (a ) (6) x ·x – x · x

2、判断下面计算是否正确？如果有错误请改正：

3 3 6 6

4 24 (1) (x ) = x

(2)a · a = a

3、联系拓广。 ⑴ a 12 ＝（a 3）( ) ＝（a 2）( )＝a 3 a ( )＝（ ）3 ＝（ ）4 ⑴ a ＝（a ） ＝（a ） ＝a a ＝（ ） ＝（ ）

⑵ 3

2﹒9m ＝3( ) ⑶ y 3n ＝3, y 9n ＝

. ⑷ （a 2）m +1 ＝ .

⑸ [（）3]2 ＝（b-a ）( ) m m 9 ， 则 m ＝ .

(7)如果2a ＝3 ,2b ＝6 ,2c ＝12 , 那么、c 的关系是

.

4、混合运算习题：

（1） a 3·a 4·a+(a 2)4 +(-2a 4)2

（2） 2(x 3)2·x 3 –(3x 3)3+(5x )

2·x 7

（3）0.25100×4100 (4) 812×0.12513

5、提高练习：

1

- 2100?0.5100?(-1)2003-

（1）、计算：2

（2）、已知2m=3，2n = 4求23m + 2n 的值。

y n= 3 求(x2y)2n的值。

（3）、已知x n =

5

（4）、已知a = 255 ，b = 344 ，c = 533 ，试比较a、b、c 的大小。

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