已知x+y=1,则0.5x^2+xy+0.5y^2=
问题描述:
已知x+y=1,则0.5x^2+xy+0.5y^2=
答
原式=0.5(x^2+2xy+y^2)
=0.5*(x+y)^2
=0.5*1
=0.5