12+5= 4+5= 18-3= 8+4=
7+2= 4+9= 9-2= 11+2=
9-4= 5+8= 4-0= 7+8=
10-4= 7+5= 9-9= 10+6=
12-1= 5+6= 10-8= 17-4=
3+4= 16-4= 7-5= 9+4=
8+6= 5+7= 3+9= 8+2=
6+7= 2+9=
|
9 |
|
|
12 |
|
10 |
12 |
|
16 |
|
|
914 124+9
7+88+7 ★+6★+4
左图是法,右图是法.
买两样文具,最少要元,最多要元.