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因式分解 4(3X+Y)平方-9(X-2Y)平方
人气:336 ℃ 时间:2019-12-11 01:36:23
解答
4(3x+y)^2-9(x-2y)^2
=[2(3x+y)-3(x-2y)][2(3x+y)+3(x-2y)]
=(6x+2y-3x+6y)(6x+2y+3x-6y)
=(3x+8y)(9x-4y)
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