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