n为正整数时,(ab)^n=a^nb^n
(ab)^n=(ab)×(ab)×(ab)×···×(ab) (共n个)
=(a×a×a×···×a)×(b×b×b×···×b)
=a^n×b^n
(-8)的2011次幂乘八分之一的2012次幂
=[(-8)×1/8]^2011×1/8
=-1×1/8
=-1/8
n为正整数时,(ab)^n=a^nb^n
(ab)^n=(ab)×(ab)×(ab)×···×(ab) (共n个)
=(a×a×a×···×a)×(b×b×b×···×b)
=a^n×b^n
(-8)的2011次幂乘八分之一的2012次幂
=[(-8)×1/8]^2011×1/8
=-1×1/8
=-1/8