Ответ:

Пошаговое объяснение:

1) 11/12 : -(5/7) = 11/12*(-7/5) = -77/60= -1  17/60

  -12/13 : 5/3 = -12/13*3/5 = -36/65

  -14/13 : (-7) = 14/13*1/7 = 2/13

2) 8 : (-24/13) = 8*(-13/24) = -13/3 = -4  1/3

  -16/9 : 8/3 = -16/9*3/8 = -2/3

  -28/25 : (-24/15) = 28/25*15/24 = 7/10

3) -7*(-15/14)*(-16/15)*(-17/16)*(-18/17)*(-19/18) = (7*15*16*17*18*19)/(14*15*16*17*18) = (7*19)/14 = 19/2 = 9  1/2