一道因式分解,急.
x的平方-3x的三次方-9+27x
人气:494 ℃ 时间:2020-05-12 13:21:52
解答
x的平方-3x的三次方-9+27x
= -x²(3x-1)+9(3x-1)
=(3x-1)(9-x²)
=(3x-1)(3-x)(3+x)
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