把(x+y),(x-y)个作为一个整体合并同类项
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把(x+y),(x-y)个作为一个整体合并同类项
1,7(x+y)-2(x+y)-4(x+y)+2(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
1,7(x+y)-2(x+y)-4(x+y)+2(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
![把(x+y),(x-y)个作为一个整体合并同类项](/uploads/image/z/17864351-71-1.jpg?t=%E6%8A%8A%28x%2By%29%2C%28x-y%29%E4%B8%AA%E4%BD%9C%E4%B8%BA%E4%B8%80%E4%B8%AA%E6%95%B4%E4%BD%93%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9)
1,7(x+y)-2(x+y)-4(x+y)+2(x+y)
=3(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
=-(x-y)²+(x-y)
=3(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
=-(x-y)²+(x-y)
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