20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
19 - 9 =
0 - 0 =
0 - 0 =
1 - 0 =
3 - 1 =
19 - 0 =
12 - 11 =
1 - 0 =
1 - 0 =
16 - 16 =
4 - 0 =
10 - 8 =
2 - 1 =
3 - 0 =
7 - 2 =
7 - 4 =
14 - 10 =
9 - 6 =
20 - 17 =
11 - 10 =