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3x²+5xy-2y²+x+9y-4因式分解啊~
人气:122 ℃ 时间:2020-01-18 23:59:21
解答
3x²+5xy-2y²+x+9y-4
=(3x-y)(x+2y)+4x+8y-3x+y-4
=(3x-y+4)(x+2y)+-3x+y-4
=(3x-y+4)(x+2y-1)
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