減法
| [0] | (+11) − (-6) | = | |
| [1] | (-7) − (+15) | = | |
| [2] | (+14) − (+7) | = | |
| [3] | (+7) − (-9) | = | |
| [4] | (-11) − (+14) | = | |
| [5] | (-11) − (-19) | = | |
| [6] | (-6) − (-14) | = | |
| [7] | (-8) − (+12) | = | |
| [8] | (-13) − (+14) | = | |
| [9] | (-9) − (+15) | = |
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