x2-y2\x+y-2(x+y),其中x=3,y=-1\3
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![x2-y2\x+y-2(x+y),其中x=3,y=-1\3](/uploads/image/z/8799838-70-8.jpg?t=x2-y2%5Cx%2By-2%28x%2By%29%2C%E5%85%B6%E4%B8%ADx%3D3%2Cy%3D-1%5C3)
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x2-y2\x+y-2(x+y),其中x=3,y=-1\3
x2-y2\x+y-2(x+y),其中x=3,y=-1\3
x2-y2\x+y-2(x+y),其中x=3,y=-1\3