已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为 A.-1 B.0 C.2已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为A.-1B.0C.2D.1
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![已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为 A.-1 B.0 C.2已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为A.-1B.0C.2D.1](/uploads/image/z/14575623-15-3.jpg?t=%E5%B7%B2%E7%9F%A5x%2Cy%E6%BB%A1%E8%B6%B3%E7%AD%89%E5%BC%8F2x%2Bx%26%23178%3B%2Bx%26%23178%3By%26%23178%3B%2B2%3D-2xy%2C%E9%82%A3%E4%B9%88x%2By%E7%9A%84%E5%80%BC%E4%B8%BA+A.-1+B.0+C.2%E5%B7%B2%E7%9F%A5x%2Cy%E6%BB%A1%E8%B6%B3%E7%AD%89%E5%BC%8F2x%2Bx%26%23178%3B%2Bx%26%23178%3By%26%23178%3B%2B2%3D-2xy%2C%E9%82%A3%E4%B9%88x%2By%E7%9A%84%E5%80%BC%E4%B8%BAA.-1B.0C.2D.1)
已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为 A.-1 B.0 C.2已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为A.-1B.0C.2D.1
已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为 A.-1 B.0 C.2
已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为
A.-1
B.0
C.2
D.1
已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为 A.-1 B.0 C.2已知x,y满足等式2x+x²+x²y²+2=-2xy,那么x+y的值为A.-1B.0C.2D.1
因为2x+x²+x²y²+2=-2xy
所以(x²+2x+1)+x²y²+2xy+1=0
所以(x+1)²+(xy+1)²=0
所以x+1=0 xy+1=0
所以x=-1,y=1
所以x+y=0