问题
解答题
若(x﹣z)2﹣4(x﹣y)(y﹣z)=0,试求x+z与y的关系.
答案
解:∵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.
若(x﹣z)2﹣4(x﹣y)(y﹣z)=0,试求x+z与y的关系.
解:∵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.