Question

当m为正整数,n为正奇数,且x不等于y时,—（x—y）的m次方乘（y—x）的n次方等于

Answer 1

-(x-y)^m*(y-x)^n=-(x-y)^m*[(-1)^n*(x-y)^n

==-(x-y)^m*[-(x-y)^n]=(x-y)^(m+n)