作业帮已知x y满足等式2x+x²+x²y²+2=-2xy,x+y值为 A.-1 B.0 C.2 D.1
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已知x y满足等式2x+x²+x²y²+2=-2xy,x+y值为 A.-1 B.0 C.2 D.1
已知x y满足等式2x+x²+x²y²+2=-2xy,x+y值为 A.-1 B.0 C.2 D.1
已知x y满足等式2x+x²+x²y²+2=-2xy,x+y值为 A.-1 B.0 C.2 D.1
2x+x²+x²y²+2=-2xy
2x+x²+x²y²+2+2xy=0
（x+1)^2 +(xy+1)^2 =0
x=-1,xy=-1,y=1
x+y=0
B