若x，y为实数，满足x-1+(3x+y-1)2=0，则±5x+y2=______．

题型：填空题难度：一般来源：不详

若x，y为实数，满足

x-1

+(3x+y-1)2=0，则±

5x+y2

=______．

答案

∵

x-1

+（3x+y-1）²=0
∴

x-1=0 3x+y-1=0

，
解得

x=1 y=-2

则±

5x+y2

=±

5×1+(-2)2

=±3．