F4 Math一問~~~~~
回答 (1)
2007-10-05 3:37 am
✔ 最佳答案
Let y=2xSo, x=y/2
f(y/2)=20(y/2)^2-6(y/2)+3
f(y/2)=20(y^2/4)-3y+3
f(y/2)=5y^2-3y+3
So, f(x)=5x^2-3x+3
f(1/2)=5(1/2)^2-3(1/2)+3
f(1/2)=5(1/4)-3/2+3
f(1/2)=5/4-6/4+12/4
f(1/2)=11/4
收錄日期: 2021-04-13 19:21:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071004000051KK03222