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数学
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2x三次方+x²-5x+2 因式分解
人气:332 ℃ 时间:2019-11-04 09:07:24
解答
2x^3+x^2-5x+2
=2x^3+x^2-x -4x+2
=x(2x^2+x-1)-2(2x-1)
=x(x+1)(2x-1)-2(2x-1)
=(2x-1)(x^2+x-2)
=(2x-1)(x-1)(x+2)
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