Пошаговое объяснение:

А

1) 7 1/3 : (-1 2/9) = 22/3 : (-11/9) = 22/3 * (-9/11) = 2/1 * (-3/1) = -6/1 = -6

2) -6 * 2/3 = -12/3 = -4

3) 5 1/15 * 5/13 = 76/15 * 5/13 = 76/3 * 1/13 = 76/39

4) 76/39 * (1 1/2)² = 76/39 * (3/2)² = 76/39 * 9/4 = 19/13 * 3/1 = 57/13 = 4 5/13

5) -4 - 4 5/13 = -8 5/13

Б

1) -4,5 : (-2/5) = -4,5 : (-0,4) = 11,25

2) 2,1 : (-0,1) = -21

3) 11,25 - (-21) = 11,25 + 21 = 32,25

В

1) 1/3 : (-2/3) = 1/3 * (-3/2) = 1/1 * (-1/2) = -1/2

2) -5/9 : (-4/3) = -5/9 * (-3/4) = -5/3 * (-1/4) = 5/12

3) -1/2 + 5/12 = -6/12 + 5/12 = -1/12