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数学
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3x^2-4x-1 因式分解
人气:148 ℃ 时间:2020-01-24 19:42:44
解答
3x^2-4x-1
=3(X^2-4/3x)-1
=3(x^2-4/3x+4/9)-7/3
=3[(x-2/3)^2-7/9]
=3(x-2/3+根号7/3)(x-2/3-根号7/3)
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