✔ 最佳答案
1
y=√3Sinx+Cosx
=2(√3/2Sinx+1/2Cosx)
=2[Cos(π/6)Sinx+Sin(π/6)Cosx]
=2Sin(π/6+x)
max=2
2
Sol
Set p=2^x
y=5+6p-p^2
=-(p^2-6p)+5
=-(p^2-6p+9)+14
=-(p-3)^2+14
0<=x<=2
2^0<=2^x<=2^2
1<=p<=4
-2<=p-3<=1
0<=(p-3)^2<=4
-4<=-(p-3)^2<=0
10<=-(p-3)^2=14<=14
10<=5+3*2^(x+1)-4^x<=14
5(1) f(1)=3(a+1)/(a-1)=3a+1=3a-3a=2(2)定義域:{x|x<>0}
(a^x+1)/(a^x-1)=y
a^x+1=ya^x-y
(1-y)a^x=-y-1
a^x=(y+1)/(y-1)
(y+1)/(y-1)>0
(y+1)(y-1)>0
y>1 or y<-1
值域::{y|y>1 or y<-1}
f(-x)=(a^-x+1)/(a^-x-1)
=[a^x(a^-x+1)/[a^x(a^-x-1)]
=(1+a^x)/(1-a^x)
=-f(x)
為奇函數