9 + 1 = 10 | 10 - 1 = 9 |
99 + 1 = 100 | 100 - 1 = 99 |
999 + 1 = 1000 | 1000 - 1 = 999 |
9999 + 1 = 10000 | 10000 - 1 = 9999 |
99999 + 1 = 100000 | 100000 - 1 = 99999 |
999999 + 1 = 1000000 | 1000000 - 1 = 999999 |
. | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | + |
. | . | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | . |
. | . | . | 7 | 6 | 5 | 4 | 3 | 2 | 1 | . |
. | . | . | . | 6 | 5 | 4 | 3 | 2 | 1 | . |
. | . | . | . | . | 5 | 4 | 3 | 2 | 1 | . |
. | . | . | . | . | . | 4 | 3 | 2 | 1 | . |
. | . | . | . | . | . | . | 3 | 2 | 1 | . |
. | . | . | . | . | . | . | . | 2 | 1 | . |
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. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | + |
. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | . | . |
. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | . | . | . |
. | 1 | 2 | 3 | 4 | 5 | 6 | . | . | . | . |
. | 1 | 2 | 3 | 4 | 5 | . | . | . | . | . |
. | 1 | 2 | 3 | 4 | . | . | . | . | . | . |
. | 1 | 2 | 3 | . | . | . | . | . | . | . |
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. | 1 | . | . | . | . | . | . | . | . | . |
1 | 0 | 8 | 3 | 6 | 7 | 6 | 2 | 6 | 9 | . |