定义新运算a※b=x/a+b+y/ab,已知1※2=8,(-2)※3=4,则3※（-4）的值为

1※2=x+2+y/2=8,x+y/2=6,2x+y=12
(-2)※3=x/(-2)+3+y/(-6)=4,x/(-2)+y/(-6)=1,3x+y=-6
所以x=-18,y=48
3※(-4)=-18/3+48+48/(-12)
=-6+48-4
=38.