(x+y)/2+(x-y)/3=5/6,①(x+y)/6-(x-y)/3=1/2 ②①+②，得(x+y)/2+(x+y)/6=5/6+1/2，则2(x+y)/3=4/3，则x+y=2 ③代入①，得2/2+(x-y)/3=5/6，则(x-y)/3=-1/6，则x-y=-1/2 ④③+④，得2x=3/2，则x=3/4 代入③，得3/4+y=2，则y=5/4
