Ответ:

Пошаговое объяснение:

1/4(6а - 3) - 1/5(15b + 4) =

6/4a - 3/4 - 15/5b - 4/5 =

3/2a - 3/4 - 3b - 4/5 =

3/2a - 15/20 - 3b - 16/20 =

3/2a - 31/20 - 3b

3/2 * 3. 1/4 - 31/20 - 3 * 8/10 =

3/2 * 13/4 - 1. 11/20 - 24/10 =

39/8 - 1. 11/20 - 24/10 =

4. 7/8 - 1. 11/20 - 2. 4/10 =

4. 35/40 - 1. 22/40 - 2. 16/40 =

3. 13/40 - 2. 16/40 =

2. 53/40 - 2. 16/40 = 37/40

Ответ: 37/40