把x-y看做一个整体,合并同类项. 3(y-x)^2+2(x-y)+(y-x)-(x-y)^2
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把x-y看做一个整体,合并同类项. 3(y-x)^2+2(x-y)+(y-x)-(x-y)^2
![把x-y看做一个整体,合并同类项. 3(y-x)^2+2(x-y)+(y-x)-(x-y)^2](/uploads/image/z/19721009-65-9.jpg?t=%E6%8A%8Ax-y%E7%9C%8B%E5%81%9A%E4%B8%80%E4%B8%AA%E6%95%B4%E4%BD%93%2C%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9.+3%28y-x%29%5E2%2B2%28x-y%29%2B%28y-x%29-%28x-y%29%5E2)
3(y-x)^2+2(x-y)+(y-x)-(x-y)^2
= 3(x-y)^2+2(x-y)-(x-y)-(x-y)^2
=2(x-y)^2+(x-y)
= 3(x-y)^2+2(x-y)-(x-y)-(x-y)^2
=2(x-y)^2+(x-y)
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