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问题: n难N难啊

分解因式

解答:

2(x-y)(x+y)-(x+y)^2=
(x+y)[2(x-y)-(x+y)]=
(x+y)(x-3y)

2ax^2-8axy+8ay^2=
2a(x^2-4xy+4y^2)=
2a(x-2y)^2