Ответ:

Пошаговое объяснение:

а) = (18/15 - 10/15) * 1/2 = 8/15 * 1/2 = 8/30 = 4/15

б) = (24/20 - 15/20) * 2/3 = 9/20 * 2/3 = 18/60 = 3/10

в) = 11/18 - (1/3 * 1/4) = 11/18 - 1/12 = 22/36 - 3/36 = 19/36

г) = 29/30 - (1/3 * 1/5) = 29/30 - 1/15 = 29/30 - 2/30 = 27/30 = 9/10

д) = 8/5 * (6/8 + 11/8) = 8/5 * 17/8 = 17/5 = 3. 2/5

е) = 18/7 * (8/18 + 15/18) = 18/7 * 23/18 = 23/7 = 3. 2/7

ж) = 24/20 + 11/8 = 48/40 + 55/40 = 103/40 = 2. 23/40

и) = 72/63 + 15/14 = 8/7 + 15/14 = 16/14 + 15/14 = 31/14 = 2. 3/14