Question

已知x,y满足(2-xy)的绝对值+(x+y-2分之5)的2次方=0,求-(x)的2次方y-x(y)的2次方

Answer 1

根据题意得

2-xy=0

x+y-5/2=0

∴x+y=5/2

xy=2

-x²y-xy²

=-xy(x+y)

=-2×5/2

=-5