x^2-4y^2+2x-4y
人气:422 ℃ 时间:2020-01-27 12:37:41
解答
x^2-4y^2+2x-4y
=(x^2+2x+1)-(4y^2+4y+1)
=(x+1)^2-(2y+1)^2
=(x+1+2y+1)(x+1-2y-1)
=(x+2y+2)(x-2y)
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