因式分解x³-11x²+31x-21
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解决时间 2021-02-23 01:21
- 提问者网友:临风不自傲
- 2021-02-22 09:43
因式分解x³-11x²+31x-21
最佳答案
- 五星知识达人网友:痴妹与他
- 2021-02-22 10:06
x³-11x²+31x-21
=x³-x²-10x²+10x+21x-21
=x²(x-1)-10x(x-1)+21(x-1)
=(x-1)(x²-10x+21)
=(x-1)(x-3)(x-7)
=x³-x²-10x²+10x+21x-21
=x²(x-1)-10x(x-1)+21(x-1)
=(x-1)(x²-10x+21)
=(x-1)(x-3)(x-7)
全部回答
- 1楼网友:污到你湿
- 2021-02-22 10:32
- 2楼网友:一袍清酒付
- 2021-02-22 10:16
x³-11x²+31x-21
=(x-1)(x²-10x+21) (这一步用综合除法来做)
=(x-1)(x-3)(x-7)
=(x-1)(x²-10x+21) (这一步用综合除法来做)
=(x-1)(x-3)(x-7)
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