Вычислите: а) - 2/5:6 б) - 6:3/12 в) - 5/8: (-15) г) - 2/7:8/7 д) - 2/9: (-8) е) 1/45: (-2/15) ж) 2: (-2/7) з) 5 целых 4/9:1/9

а) - 2/5:6 = ( - 2/5) * (1/6) = - 2 / (5*6) = - 2/30 = - 1/15;

б) - 6:3/12 = - 6*12/3 = - 2*12 = - 24;

в) - 5/8: (-15) = (5/8) * (1/15) = 5 / (8*15) = 1 / (8*3) = 1/24;

г) - 2/7:8/7 = - (2/7) * (7/8) = - (2*7) / (7*8) = - 2/8 = - 1/4;

д) - 2/9: ( - 8) = (2/9) * (1/8) = 2 / (9*8) = 1/36;

е) 1/45: ( - 2/15) = - (1/45) * (15/2) = - 15 / (45*2) = - 1/6;

ж) 2: ( - 2/7) = - 2*7/2 = - 7.

з) 5 4/9:1/9 = ((5*9+4) / 9) * 9 = (49/9) * 9 = 49.