(x+y)/2+(x-y)/3=1 ====>1式4(x+y)-5(x-y)=2 ===>2式1式乘以24 ===>12(x+y)+8(x-y)=242式乘以3 ===>12(x+y)-15(x-y)=6解得x+y=34/23x-y=18/23得x=26/23y=8/23
x=52/109,y=30/109
