(x-1)`2=(x-1)(1-2x)
更新1:
用因式分解 (x-1)`2=(x-1)(1-2x) `2=二次方
快...數學問題
回答 (2)
2007-10-26 2:51 pm
✔ 最佳答案
我用(x-1)^2代替你的(x-1)`2先Factorize
(x-1)^2 = (x-1)(1-2x)
(x-1)(x-1) = (x-1)(1-2x)
x^2 - 2x + 1 = x - 2x^2 + 2x - 1
3x^2 - 5x + 2 = 0
(3x - 2)(x - 1) = 0
x = 2/3 or x = 1
注意在第二個step
唔好cancel (x-1)
因為會令答案少左個
2007-10-26 6:47 am
x-1)`2
2 前面一點即係點解呀~~
2 前面一點即係點解呀~~
收錄日期: 2021-04-18 23:38:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071025000051KK04526