吧(x-y)当做一个因式,合并同类项2(x-y)的平方-7(x-y)+3(x-y)的平方-(x-y)
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![吧(x-y)当做一个因式,合并同类项2(x-y)的平方-7(x-y)+3(x-y)的平方-(x-y)](/uploads/image/z/2541875-59-5.jpg?t=%E5%90%A7%28x-y%29%E5%BD%93%E5%81%9A%E4%B8%80%E4%B8%AA%E5%9B%A0%E5%BC%8F%2C%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B92%28x-y%29%E7%9A%84%E5%B9%B3%E6%96%B9-7%EF%BC%88x-y%EF%BC%89%2B3%28x-y%29%E7%9A%84%E5%B9%B3%E6%96%B9-%EF%BC%88x-y%EF%BC%89)
吧(x-y)当做一个因式,合并同类项2(x-y)的平方-7(x-y)+3(x-y)的平方-(x-y)
吧(x-y)当做一个因式,合并同类项2(x-y)的平方-7(x-y)+3(x-y)的平方-(x-y)
吧(x-y)当做一个因式,合并同类项2(x-y)的平方-7(x-y)+3(x-y)的平方-(x-y)
2(x-y)的平方-7(x-y)+3(x-y)的平方-(x-y)
=2(x-y)的平方+3(x-y)的平方-7(x-y) -(x-y)
=5(x-y)²-8(x-y)