积的乘方专项练习50题(有答案)知识讲解
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积的乘方专项练习50题(有答案)
积的乘方专项练习
50题(有答案)
知识点: 1.积的乘方法则用字母表示就是:当n 为正整数时,(ab )n =_______.
2.在括号内填写计算所用法则的名称.
(-x 3yz 2)2
=(-1)2(x 3)2y 2(z 2)2( )
=x 6y 2z 4 ( )
3.计算:
(1)(ab 2)3=________; (2)(3cd )2=________;
(3)(-2b 2)3=________; (4)(-2b )4=________;
(5)-(3a 2b )2=_______; (6)(-32
a 2
b )3=_______; (7)[(a -b )2] 3=______; (8)[-2(a+b )] 2=________.
专项练习:
(1)(-5ab)2 ( 2)-(3x 2y)2
(3)332)3
11(c ab (4)(0.2x 4y 3)2 (5)(-1.1x m y 3m )2 ( 6)(-0.25)11×411
(7)(-a2)2·(-2a3)2 (8)(-a3b6)2-(-a2b4)3 (9)-(-x m y)3·(xy n+1)2
(10)2(a n b n)2+(a2b2)n
(11)(-2x2y)3+8(x2)2·(-x2)·(-y3)
(12)(-2×103)3
(13)(x2)n·x m-n
(14)a2·(-a)2·(-2a2)3
(15)(-2a4)3+a6·a6
(16)(2xy2)2-(-3xy2)2
(17)620.25(32)⨯-
(18)4224223322()()()()()()x x x x x x x x +-⋅--⋅-⋅-;
(19)(-4
1a n 3- b 1-m )2(4a n 3-b )2
(20)(-2a 2b )3+8(a 2)2·(-a )2·(-b )3
(21) 2112168(4)8m m m m --⨯⨯+-⨯ (m 为正整数)
(22)(-3a 2)3·a 3+(-4a )2·a 7-(5a 3)3
(23)=+-222)(3ab b a
(24)3223)()(a a -+-
(25) [(-32)8×(2
3)8]7
(26)81999·(0.125)2000
(27)2232)2
1()2(ab b a -
(28) 33323)5()3(a a a -⋅-
(29)232])2([x -
(30) 99)8()8
1(-⨯ (31)20102009)532()135(
⨯
(32)3322)103()102(⨯⨯⨯.
(33)25234)4()3(a a a ---⋅
(34)232324)()(b a b a -⋅-
(35)(231)20·(7
3)21. 1010)128910()1218191101(⨯⨯⋯⨯⨯⨯•⨯⨯⋯⨯⨯⨯.
(37)已知32=a ,43=a ,求a 6.
(38)203)(a a a y x =⋅,当2=x 时,求y 的值.
(39)化简求值:(-3a 2b )3-8(a 2)2·(-b )2·(-a 2b ),其中a=1,b=-
1.
(40)先完成以下填空:
(1)26×56=( )6=10( ) (2)410×2510=( )10=10( )
你能借鉴以上方法计算下列各题吗?
(3)(-8)10×0.12510
(4)0.252007×42006
(5)(-9)5·(-23
)5·(13)5
(41)已知x n =2,y n =3,求(x 2y )2n 的值.
(42)一个立方体棱长为2×103厘米,求它的表面积(结果用科学记数法表示).
(43)已知2m =3,2n =22,则22m+n 的值是多少
(44)已知()8
321943a ⎛⎫⋅= ⎪⎝⎭,求3a 的值
(45).已知105,106αβ==,求2310αβ+的值
(46)已知:5=n x ,3=n y ,求n xy 2)(的值.
(47)已知x n =5,y n =3,求 (x 2y)n -x n 2的值。
(48)若有理数a,b,c 满足(a-1)2+|c+1|+|2
b |=0,试求a 3n+1b 3n+2-
c 4n+2 (49)比较大小:218×310与210×318
(50)观察下列等式:
13=12;
13+23=32;
13+23+33=62;
13+23+33+43=102;
(1)请你写出第5个式子:______________
(2)请你写出第10个式子:_____________ (3)你能用字母表示所发现的规律吗?试一试!
答案:
知识点:
1.a n b n 2.积的乘方法则,幂的乘方法则3.(1)a3b6(2)9c2d2(3)-8b6(4)16b4 •
(5)-9a4b2(6)-27
8
a6b3(7)(a-b)6(8)4(a+b)2
专项练习:
(1) 25a2b2(2) -9x4y4
(3)-2764a 3b 6c 9 (4)25
1x 8y 6 (5)1.21x m 2y m 6 ( 6)-1
(7)4a 10 ( 8)2a 6b 12
(9) x 2m 3+y 5n 2+ (10)3a n 2b n 2
(11)7x 6y 3 (12) -8×109
(13)x m+n (14) -8a 10
(15)-7a 12 (16)-5x 2y 4
(17)4
1 (18)0 (19)a n 412-b m
2 (20)-16a 16b 3
(21)0 (22)-136a 9
(23)-2a 2b 2 (24)0
(25) 1 (26)0.125
(27) -2a 8b 7 (28) 4a 9
(29) 64x 12 (30) 1 (31)5
13 (32)1.08×1013 (33)-7a 10 (34)1216b a - (35)7
3 (36)1 (37)a 6=(2×3)a =2a ×3a =3×4=12
(38)