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(ax+by)^2-(ay+bx)^2
人气:133 ℃ 时间:2020-05-25 03:15:13
解答
(ax+by)²-(ay+bx)²
=(ax+by+ay+bx)(ax+by-ay-bx)
=[a(x+y)+b(x+y)][a(x-y)-b(x-y)]
=(a+b)(x+y)(x-y)(a-b)
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