15-96 16-84 17-919-10
17-75 10-611-7 12-713-9
16-814-8 14-917-6 16-718-8
11-=4 17-9= 11-8=
-7=8 15-=8 13-=8
14-=5 -8=8 -9=7
12-6= 16-=9 15-=9
小白兔拔了多少个萝卜?