若x²+y²-2x+2y+2=0,则(x-y)³的值为( )若x²+y²-2x+2y+2=0,则(x-y)³的值为( )A.0 B.1 C.8 D.-8
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![若x²+y²-2x+2y+2=0,则(x-y)³的值为( )若x²+y²-2x+2y+2=0,则(x-y)³的值为( )A.0 B.1 C.8 D.-8](/uploads/image/z/2702862-54-2.jpg?t=%E8%8B%A5x%26%23178%3B%2By%26%23178%3B-2x%2B2y%2B2%3D0%2C%E5%88%99%28x-y%29%26%23179%3B%E7%9A%84%E5%80%BC%E4%B8%BA%28+%29%E8%8B%A5x%26%23178%3B%2By%26%23178%3B-2x%2B2y%2B2%3D0%2C%E5%88%99%28x-y%29%26%23179%3B%E7%9A%84%E5%80%BC%E4%B8%BA%28+%29A.0+B.1+C.8+D.-8)
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若x²+y²-2x+2y+2=0,则(x-y)³的值为( )若x²+y²-2x+2y+2=0,则(x-y)³的值为( )A.0 B.1 C.8 D.-8
若x²+y²-2x+2y+2=0,则(x-y)³的值为( )
若x²+y²-2x+2y+2=0,则(x-y)³的值为( )
A.0 B.1 C.8 D.-8
若x²+y²-2x+2y+2=0,则(x-y)³的值为( )若x²+y²-2x+2y+2=0,则(x-y)³的值为( )A.0 B.1 C.8 D.-8
配方原式子
(x-1)²+(y+1)²=0 只有x=1 y=-1
所以.