6/35 · (-25/36) = -(1·5)/(7·6) = -5/42
13/24 · (-16/39) = -(1·2)/(3·3) = -2/9
12/13 · 26/27 = (4·2)/(1·9) = 8/9
17/26 · (-13/1) = -(17·1)/(2·1) = -17/2 = -8 целых 1/2
6/35 · (-25/36) = -(1·5)/(7·6) = -5/42
13/24 · (-16/39) = -(1·2)/(3·3) = -2/9
12/13 · 26/27 = (4·2)/(1·9) = 8/9
17/26 · (-13/1) = -(17·1)/(2·1) = -17/2 = -8 целых 1/2