10a(x-y)²-5a(y-x)
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10a(x-y)²-5a(y-x)
10a(x-y)²-5a(y-x)
10a(x-y)²-5a(y-x)
10a(x-y)²-5a(y-x)
=10a(x-y)²+5a(x-y)
=5a(x-y)[2(x-y)+1]
汗。。。。。。。。。。题目不会就是这样吧