6/9+12/17+6/9+7/17=102/153+108/153+102/153+108/153=(102/153+108/153)*2=210/153*2=420/153=2 целых 114/153=2 целых 38/51
нок(9,17)=153
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6/9+12/17+6/9+7/17=102/153+108/153+102/153+108/153=(102/153+108/153)*2=210/153*2=420/153=2 целых 114/153=2 целых 38/51
нок(9,17)=153