Question

把x-y看成一个整体,计算（-x+y)^2*(x-y)^4*(y-x)

Answer 1

（-x+y)^2*(x-y)^4*(y-x)=[-(x-y)]^2**(x-y)^4*[-(x-y)]

=-(x-y)^7

（a-b+c)^2*(b-a-c)^4*(a+c-b)*(b-c-a)^3

=（a-b+c)^2*[-(a-b+c)]^4*(a-b+c)*[-(a-b+c)]^3

=-(a-b+c)^10