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?

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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?
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?

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?
设log3(x)=t
f(x)=t+2
f(x²)=log3(x²)+2=2log3(x)+2
F(x)=(t+2)²-【(2t+2)】
=t²+4t+4-2t-2
=t²+2t+2