已知x/2+y/2-z/2=3,求x^2+2xy+y^2-2xz-2yz+z^2
问题描述:
已知x/2+y/2-z/2=3,求x^2+2xy+y^2-2xz-2yz+z^2
答
X+Y-Z=6
(X+Y-Z)^2=36
所以x^2+2xy+y^2-2xz-2yz+z^2 =36