1) 18 * 1\81 = 1
2) 20 * 1\9= 20\1 * 1\9 = 20\9
3) 1 - 20\9= 9-20 \ 9= - 11\9
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1) 18 * 1\81 = 1
2) 20 * 1\9= 20\1 * 1\9 = 20\9
3) 1 - 20\9= 9-20 \ 9= - 11\9