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)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)

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)