问题描述:
已知函数f(x)=log3(x)+2,x∈[1/9,9],F(x)=[f(x)]^2-f(x^2)的值域是
A [2,5] B [1,5] C [1,10] D [2,10]
设log3(x)=t,那么F(x)=[f(x)]^2-f(x^2)=(t+2)^2-t^2-2=4t+2这不对么?
A [2,5] B [1,5] C [1,10] D [2,10]
设log3(x)=t,那么F(x)=[f(x)]^2-f(x^2)=(t+2)^2-t^2-2=4t+2这不对么?
问题解答:
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