(100a+10b+c)/13=a+b+c
100a+10b+c=13a+13b+13c
87a=3b+12c
a只能为1
87=3b+12c
c=7,b=1
c=6,b=5
c=5,b=9
满足此条件的三位数:117,156,195
117+156+195=468