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x^2+x-4y^2-2y
人气:494 ℃ 时间:2020-04-15 11:58:38
解答
x^2+x-4y^2-2y
=(x^2-4y^2)+(x-2y)
=(x-2y)(x+2y)+(x-2y)
=(x-2y)(x+2y+1)
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