问题 填空题 若实数x,y满足x-2+(2x+y-5)2=0,则(x+y)2=______. 答案 ∵x-2+(2x+y-5)2=0,∴x-2=0,2x+y-5=0,解得x=2,y=1,∴(x+y)2=(2+1)2=9