a) -27/20 * (-5/9) - 5/24 * (-22/5) = 135/180 + 110/120 = 405/360 + 330/360 = 705/360 = 1 145/360 = 1 29/72
б) 2:(-3/5) - 3/2 * 6/7 = -3/10 - 18/14 = -21/70 - 90/70 = -111/70 = -1 41/70
а)-6
б)43/21
Пошаговое объяснение:
