2分之x+y+3分之x-y＝1又6分之5 4(x+y)-5(x-y)=7 方程组的解

(x+y)/2+(x-y)/3=11/6 (1)
4(x+y)-5(x-y)=7 (2)
(1)式两边乘以6,即3(x+y)+2(x-y)=11,3x+3y+2x-2y=11,则5x+y=11 (3)
(2)式化简,4x+4y-5x+5y=7,则-x+9y=7 (4)
(3)式两边乘以9,即45x+9y=99 (5)
由(4)-(5),得-46x=-92,解得x=2
将x=2代入(4)式解得y=1
则x=2,y=1