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

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由
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