x^2+y^2+3-xy-3y因式分解

问题描述:

x^2+y^2+3-xy-3y因式分解

x^2+y^2+3-xy-3y
=(x^2-xy+y^2/4)+3(y^2/4-y+1)
=(x-y/2)^2+3(y/2-1)^2