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已知函数y=f(2的x次幂)的定义域是[-1,1],求函数y=f(以2为底x的对数)的定义域?过程 多谢 急
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y=f(2^x)
t=2^x,-1<=x<=1
1/2<=t<=2
y=f(x),1/2<=x<=2
1/2<=log2(x)<=2
√2<=x<=4
t=2^x,-1<=x<=1
1/2<=t<=2
y=f(x),1/2<=x<=2
1/2<=log2(x)<=2
√2<=x<=4
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