颠覆世界观的26个故事:（x-y)^3*(x-y)^2*(y-x)

（x-y)^3*(x-y)^2*(y-x) 3X(X-Y)+2Y(X-Y) (x-y)^2×(y-x)^3=??? 45(x-y)^3-30y(x-y)^2 x,y,x,y,x,y,x,y,x,y,x,y,x,y,x,y,x,y, (x-y)4*(y-x)3=(y-x)7 () .x? + y? (x+y)^3÷(x+y)=? (x+y)^2+x+y 怎么因式分解 (x+y)2-4(x+y-1)