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问题: 已知(x-y)^2-4(x-y)(y-z)=0,求x+z与y的关系

已知(x-y)^2-4(x-y)(y-z)=0,求x+z与y的关系

解答:

(x-z)^2-4(x-y)(y-z)=0
--->[(x-y)+(y-z)]^2-4(x-y)(y-z)=0
--->[(x-y)^2+2(x-y)(y-z)+(y-z)]-4(x-y)(y-z)=0
--->[(x-y)-(y-z)]^2=0
--->x-y-(y-z)=0
--->x-2y+z=0
--->x+z=2y