解方程组﹛(x+y)/2+(x-y)/3=8,4(x+y)-5(x-y)=-28
问题描述：
解方程组﹛(x+y)/2+(x-y)/3=8,4(x+y)-5(x-y)=-28
答
(x+y)/2+(x-y)/3=8,两边同时乘以6,得3(x+y)+2(x-y)=48 ①4(x+y)-5(x-y)=-28 ②①×5+②×2,得15(x+y)+8(x+y)=240-56,则23(x+y)=184,则x+y=8 ③代入①,得24+2(x-y)=48,则2(x-y)=24,则x-y=12 ④③+④,得2x=20,解得x=10...