f(x)=x/x+1
f(-x)=?
and then
if f(x)=x/x+1 find
f(x)f(-x)
ce maths
2007-07-16 4:42 am
回答 (2)
2007-07-16 4:48 am
✔ 最佳答案
f(x)=x/(x+1)f(-x)= (-x)/[(-x)+1]
f(-x)= x/(x- 1)
and then
if f(x)=x/(x+1) find
f(x)f(-x) = [x/(x+1)][x/(x- 1)]
= x2 / (x2 – 1)
2007-07-16 4:53 am
f(x)=x/x+1
f(-x)=(-x)/(-x)+1
=-x/1-x
=x/x-1
f(x)f(-x)=(x/x+1)(x/x-1)
=x^2/x^2-1
f(-x)=(-x)/(-x)+1
=-x/1-x
=x/x-1
f(x)f(-x)=(x/x+1)(x/x-1)
=x^2/x^2-1
參考: myself
收錄日期: 2021-04-23 19:28:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070715000051KK04172