Re: [中學] 求救，我被我妹問倒了...Orz
其實這還好啦
f(x) = 1 + (x+1)^2/(x^2-x+1) = 2 + 3x/(x^2 -x +1)
= 2 + 3(1 - (x-1)^2/(x^2 - x +1))
= 5 - 3(x-1)^2/(x^2 -x +1)
由於 x是實數
x^2-x+1 > 0
所以最小值是1 最大值是5
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 123.240.129.235
→
10/11 00:15, , 1F
10/11 00:15, 1F
→
10/11 13:08, , 2F
10/11 13:08, 2F
→
10/11 13:08, , 3F
10/11 13:08, 3F
→
10/11 16:02, , 4F
10/11 16:02, 4F
推
10/12 00:59, , 5F
10/12 00:59, 5F
討論串 (同標題文章)
完整討論串 (本文為第 3 之 3 篇)：