若实数x、y、z满足2|x−y|+2y+z+z2−z+1/4=0,则x+y+z=_.
问题描述:
若实数x、y、z满足2|x−y|+
+z2−z+
2y+z
=0,则x+y+z=______. 1 4
答
根据题意,2|x−y|+
+z2−z+
2y+z
=0,1 4
整理后:2|x−y|+
+(z−
2y+z
)2=0,1 2
则
,解得x=y=−
x−y=0 2y+z=0 z−
=01 2
,z=1 4
,1 2
∴x+y+z=(-
)+(−1 4
)+1 4
=0.1 2