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因式分解:-4(x-2y)2+9(x+y)2
人气:353 ℃ 时间:2020-05-26 19:46:04
解答
-4(x-2y)2+9(x+y)2
=[3(x+y)]2-[2(x-2y)]2
=(3x+3y+2x-4y)(3x+3y-2x+4y),
=(5x-y)(x+7y).
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