20 以内减法
日期：___________
姓名：___________
用时：___________
成绩：___________
9 - 7 =
19 - 1 =
7 - 1 =
17 - 2 =
2 - 2 =
17 - 3 =
16 - 12 =
2 - 2 =
1 - 1 =
20 - 8 =
18 - 0 =
1 - 0 =
17 - 1 =
4 - 0 =
19 - 5 =
4 - 4 =
19 - 19 =
0 - 0 =
10 - 7 =
18 - 0 =