Ответ:

Пошаговое объяснение:

1) -4. 8/15 * (-1,5) = -4. 8/15 * (-1. 5/10) =

-4. 8/15 * (-1. 1/2) =

-68/15 * (-3/2) = -34/5 * (-1/1) = 34/5 = 6. 4/5

2) 3. 1/3 * (-1. 3/5) =

10/3 * (-8/5) = 2/3 * (-8/1) = -16/3 = -5. 1/3

3) 6. 4/5 - (-5. 1/3) = 6. 12/15 + 5. 5/15 = 11. 17/15 = 12. 2/15

1) -2. 1/2 + 3,7 - 5. 4/5 =

-2. 1/2 + 3. 7/10 - 5. 4/5 =

-2. 5/10 + 3. 7/10 - 5. 8/10 =

1. 2/10 - 5. 8/10 =

-4. 6/10 = -4. 3/5

2) -3. 4/7 * (-4. 3/5) = -25/7 * (-23/5) =

-5/7 * (-23/1) = 115/7 = 16. 3/7