x1-y1=9 (1)x2-y2=14 (2)x1+x2=12 (3)y1+y2=2 (4)(1)+(2)x1+x2-(y1+y2)=23y1+y2=2x1+x2-2=23x1+x2=25 (5)因为x1+x2=12 (3)所以本题无解望采纳,谢谢!