Пошаговое объяснение:
7/15 = (7*2)/(15*2) = 14/30
13/20 = (13*3)/(20*3) = 39/60
10/35 = (10:5)/(35:5) = 2/7
28/49 = (28:7)/(49:7) = 4/7
18/81 = (18:9)/(81:9) = 2/9
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Пошаговое объяснение:
7/15 = (7*2)/(15*2) = 14/30
13/20 = (13*3)/(20*3) = 39/60
10/35 = (10:5)/(35:5) = 2/7
28/49 = (28:7)/(49:7) = 4/7
18/81 = (18:9)/(81:9) = 2/9