配方 f(x)=3/4x^2-2x

问题描述:

配方 f(x)=3/4x^2-2x

f(x)=3/4x^2-2x =3/4(x^2-2/3/4x)=3/4(x^2-8/3x)=3/4(x^2-8/3x+4/3^2)-16/9*3/4
=3/4(x^2-8/3x+4/3^2)-4/3