Пошаговое объяснение:

а) 5/17 * 85 = 5/1 * 5 = 25/1 = 25

в) 7/15 * 45 = 7/1 * 3 = 21/1 = 21

с) 7/3 * 45 = 7/1 * 15 = 105/1 = 105

д) 7/50 * 100 = 7/1 * 2 = 14/1 = 14

е) 4/11 * 121 = 4/1 * 11 = 44/1 = 44

ф) 2/15 * 135 = 2/1 * 9 = 18/1 = 18

г) 17/45 * (-135) = 17/1 * (-3) = -51/1 = -51

х) 21/16 * (-64) = 21/1 * (-4) = -84/1 = -84