Question

计算 幂的乘方与积的乘方

(1)、-[(-1/3)(-3x^2y^2)^3]^2

(2)、[-5^m*(-5)^n]^2
(1)、-[(-1/3)(-3x^2y^2)^3]^2
=-[(-1/3)-27x^6y^6]^2
=-(1/9)729x^12y^12
=-81x^12y^12

(2)、[-5^m*(-5)^n]^2
=[-5^m*-5^n]^2
=[5^2m*5^2n]
=5^2m+2n

Answer 1

＜1＞对的＜2＞原式=[5'(m+n)]"=5'(2m+2n)，注意在最外层为偶次方，故可以不考虑内部的负号；若为奇次方必须注意符号运算。