(2a-b)^3除以(b-2a)^3
=(2a-b)^3/[-(2a-b)]^3
=(2a-b)^3/[-(2a-b)^3]
=-1=(2a-b)^3/[-(2a-b)]^3=(2a-b)^2/[-(2a-b)^3]后面是为什么呢(x-y)的5次方 除以（y-x）的3次方=？过程=(2a-b)^3/[-(2a-b)]^3=（2a-b)^3/[(-1)^3*(2a-b)^3]=(2a-b)^2/[-(2a-b)^3] (x-y)的5次方 除以（y-x）的3次方=(x-y)^5/[-(x-y)]^3=(x-y)^5/[(-1)^3(x-y)^3]=(x-y)^5/[-(x-y)^3]=-(x-y)^(5-3)=-(x-y)^2