2x-1/5+3y-2/4=2 (1)3x+1/3-3y+2/4=4/3 (2)(1)+(2)(2x-1)/5+(3x+1)/3+(3y-2)/4-(3y+2)/4=2+4/3(21x+2)/15-1=10/321x+2=65x=3代入(2)10/3-(3y+2)/4=4/33y+2=8所以x=3,y=2
两个式子相加,得x=16/25,y=71/150
X=16/25,Y=7/50
x=18/25,y=63/150