Verified answer

3 4/15 = (3·15+4)/15 = 49/15

2 5/14 = (2·14+5)/14 = 33/14

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5m · 49/15n · 33/14k = (5·49·33)/(15·14) · mnk = (1·7·11)/(1·2) · mnk = 77/2 · mnk = 38 цiлих 1/2 · mnk = 38,5mnk.