f(x)=x2-3x,则f(2x-1) =______,f[f(x)]=_____

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f(x)=x2-3x,则f(2x-1)=______,f[f(x)]=_____f(x)=x2-3x,则f(2x-1)=______,f[f(x)]=_____f(x)=x2-3x,则f(2x-1)=

f(x)=x2-3x,则f(2x-1) =______,f[f(x)]=_____
f(x)=x2-3x,则f(2x-1) =______,f[f(x)]=_____

f(x)=x2-3x,则f(2x-1) =______,f[f(x)]=_____
f(2x-1) =4x^2-10x+4
f[f(x)]=x^4-6x^3+6x^2+9x

x2是x平方?
f(2x-1)= 4x2-10x+4
f(f(x))=x4-6x3+6x2+9x