百位 · 套题 5

20 problems
1
2 - 1 =
2
7 - 1 =
3
4 - 1 =
4
3 - 1 =
5
9 - 5 =
6
4 - 1 =
7
8 - 5 =
8
3 - 1 =
9
9 - 1 =
10
7 - 2 =
11
7 - 6 =
12
9 - 1 =
13
5 - 4 =
14
5 - 2 =
15
5 - 1 =
16
5 - 4 =
17
3 - 1 =
18
7 - 6 =
19
2 - 1 =
20
9 - 6 =
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