二進制
二進制者，逢二進一也。數字獨二，〇、一是也。因其簡便，今電腦均以二進制算數。今人所用皆十進制。
四則運算
加法表
| a+b |
|---|
| 1+1=10 |
乘法表
| a×b |
|---|
| 1×1=1 |
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