解方程5^2=45x
f(x)=4x-(-1)^x，則f(4)=
數學..THX:_
2013-11-13 4:23 am
回答 (2)
2013-11-13 4:55 am
✔ 最佳答案
f(x)=4x- (-1)^xf(4)=4*4-(-1)^4
f(4)=16-1
f(4)=15
5^2=45x
x=25/45
x=5/9
2013-11-15 2:28 am
5²=45x
25=45x
x=25/45
x=5/9
_____________________________________________________________
5²=45x
http://www.wolframalpha.com/input/?i=5%5E2%3D45x
f(x)=4x-(-1)^x
f(4)=4(4)-(-1)^(4)
f(4)=4(4)-(-1)⁴
f(4)=16-(1)
f(4)=15
_____________________________________________________________
f(x)=4x-(-1)^x
http://www.wolframalpha.com/input/?i=f%28x%29%3D4x-%28-1%29%5Ex
f(4)=4(4)-(-1)^(4)
http://www.wolframalpha.com/input/?i=4%284%29-%28-1%29%5E%284%29
25=45x
x=25/45
x=5/9
_____________________________________________________________
5²=45x
http://www.wolframalpha.com/input/?i=5%5E2%3D45x
f(x)=4x-(-1)^x
f(4)=4(4)-(-1)^(4)
f(4)=4(4)-(-1)⁴
f(4)=16-(1)
f(4)=15
_____________________________________________________________
f(x)=4x-(-1)^x
http://www.wolframalpha.com/input/?i=f%28x%29%3D4x-%28-1%29%5Ex
f(4)=4(4)-(-1)^(4)
http://www.wolframalpha.com/input/?i=4%284%29-%28-1%29%5E%284%29
參考: me & wolframalpha (參考)
收錄日期: 2021-04-13 19:48:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20131112000051KK00197