X2²+X1X2+X1²如何变成(X2+X1/2)²+3/4*X1²?

问题描述:

X2²+X1X2+X1²如何变成(X2+X1/2)²+3/4*X1²?

X2²+X1X2+X1²
=X2²+X1X2+1/4X1²+3/4X1²
=(X2+X1/2)²+3/4*X1²