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数学
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因式分解x^2-2xy-3y^2+3x-y+2
如题.
人气:348 ℃ 时间:2019-09-08 16:49:48
解答
x^2-2xy-3y^2+3x-y+2
=(x-3y)(x+y)+x-3y+2x+2y+2
=(x-3y)(x+y+1)+2(x+y+1)
=(x-3y+2)(x+y+1)
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