已知x+y=2,xy=-1⼀2,求x(x+y)的平方(1-y)-x(y+x)的平方

2025-06-22 02:18:59
推荐回答(1个)
回答1:

x(x+y)^2(1-y)-x(y+x)^2
=(x+y)^2(x-xy-x)
=(x+y)^2(-xy)
=4*1/2
=2