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Addition 加法
Subtraction 減法
100
4 + 4
8
100
7 - 4
3
200
12 + 5
17
200
13 - 6
7
300
21 + 3
24
300
24 - 3
21
400
32 + 5
37
400
32 - 5
27
500
40 + 8
48
500
48 - 6
42