(x+3)/2+(y+5)/3=7
3x+9+2y+10=42
3x+2y=23
9x+6y=69-------------------1
(x-4)/3+(2y-3)/5=30
5x-20+6y-9=30
5x+6y=59----------------------2
1-2得出:
4x=10
x=5/2
y=31/4
①式两边乘以6,可化简为3x+2y=23 .........1
②式两边乘以15,可化简为5x+6y=59.........2
1式乘以3减去2式,可得x=5/2
将x代入1或者2式中,解得y=31/4
楼上答的不错