1.(a-b)^2(b-a)^3(a-b)^-42.(-1\3xy)^2[xy(2x-y)]-2x(xy-y^2)]其中x=-1,y=2

问题描述:

1.(a-b)^2(b-a)^3(a-b)^-4
2.(-1\3xy)^2[xy(2x-y)]-2x(xy-y^2)]
其中x=-1,y=2