因式分解
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更新1:
x^(3)-7x+6
數學問題~~f.3~~因式分解
回答 (2)
2009-10-16 1:35 am
✔ 最佳答案
x^3 - 7x + 6= x^3 - x - 6x + 6
= (x^3 - x) - (6x - 6)
= x(x^2 - 1) - 6(x - 1)
= x(x - 1)(x + 1) - 6(x - 1)
= (x - 1)[x(x + 1) - 6]
= (x -1 )(x^2 + x - 6)
= (x - 1)(x - 2)(x + 3)
2009-10-21 3:38 am
收錄日期: 2021-04-21 22:03:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091015000051KK00728