x^2-xy-2y^2-x+5y-2因式分解都做做吧
人气:203 ℃ 时间:2020-03-11 22:06:25
解答
原式=(x-2y)(x+y)-x+5y-2
=(x-2y)(x+y)+(x+y)-2x+4y-2
=(x+y)(x-2y+1)-2(x-2y+1)
=(x+y-2)(x-2y+1)
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