(a) x^3+27
由這...因式分解x^3-7x+6
因式分解問題:(中學)
2006-10-25 8:45 am
回答 (2)
2006-10-26 12:33 am
✔ 最佳答案
Because a^3+b^3=(a+b)(a^2-ab+b^2)Therefore x^3+27
=x^3+3^3
=(x+3)(x^2-3x+9)
x^3-7x+6
=x^3-7x+6+21-21
=x^3-7x+27-21
=x^3+27-7(x+3)
=(x+3)(x^2-3x+9-7)
=(x+3)(x^2-3x+2)
2006-10-25 9:00 am
(x+3)(x^2-3x+9)
x^3-7x+6=(x+3)(x^2-3x+2)=(x+3)(x-1)(x-2)
x^3-7x+6=(x+3)(x^2-3x+2)=(x+3)(x-1)(x-2)
收錄日期: 2021-04-23 00:08:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061025000051KK00186