11-9 5 13-4 6 14-8 13-7
15-7 4 12-6 8 16-8 15-7
()=(根)
16-= 16-=
9+8= 17-4= 3+9= 18-6=
10-8= 0+9= 9+9= 8+5=
3+7= 19-6= 17-2= 5+10=
16-4= 14+3= 8+7= 4+8=
7+9-3= 8+7-10= 9-2+6=
9+8-6= 3+5+4= 14-4+3=
6+( )=8 12-( )=10 9-( )=4
4+( )=9 17-( )=13 9+( )=11
问题:
湖边还剩几只小船?
9+=17 +10=16 -6=6
6+>10 6+7<+7 8+6=7+