計 |x^2-5x＋5|=1
回答 (2)
2006-10-23 4:31 am
✔ 最佳答案
|x^2-5x＋5|=1 x^2-5x+5 = 1 or x^2-5x+5 = -1
x^2-5x+4 = 0 x^2-5x+6 = 0
(x-1)(x-4) = 0 (x+1)(x-6) = 0
x=1 or 4 x= -1 or 6
therefore: x = -1,1,4 or 6
參考: Myself~
2006-10-23 4:37 am
x^2-5x+5=1 and x^2-5x+5=-1
x^2-5x+5=1
x^2-5x+4=0
(x-1)(x-4)=0
x=1 or x=4
x^2-5x+5=-1
x^2-5x+6=0
(x-2)(x-3)=0
x=2 or x=3
so x=1,2,3and4
x^2-5x+5=1
x^2-5x+4=0
(x-1)(x-4)=0
x=1 or x=4
x^2-5x+5=-1
x^2-5x+6=0
(x-2)(x-3)=0
x=2 or x=3
so x=1,2,3and4
參考: 自己
收錄日期: 2021-04-12 18:08:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061022000051KK05274