若(x-z)2-4(x-y)(y-z)=0,试求x+z与y的关系.
问题描述:
若(x-z)2-4(x-y)(y-z)=0,试求x+z与y的关系.
答
∵x-z=x-y+y-z,
∴原式可化为[(x-y)+(y-z)]2-4(x-y)(y-z)=0,
(x-y)2-2(x-y)(y-z)+(y-z)2=0,
(x-y-y+z)2=0,
∴x+z=2y.