加法 - HackMD

# 加法 ``` 2+3 = ? 5 1+4 = ? 5 2+4 = ? 6 5+3 = ? 8 8+3 = ? 11 4+9 = ? 13 5+7 = ? 12 21+37 = ? 58 13+28 = ? 41 19+21 = ? 40 ```

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