问题:
若|x+y-5|+(xy-3) 2=0,则x 2+y 2的值为( )
A.19
B.31
C.27
D.23
若|x+y-5|+(xy-3) 2=0,则x 2+y 2的值为( )
A.19 | B.31 | C.27 | D.23 |
参考答案: