Заполним таблицу:
| d | 1 | 8 | 13 |
|-----|-----|-----|-----|
| 2d | 2 | 16 | 26 |
| 3d-1| 2 | 23 | 38 |
| 1,5(3d-1) | 3 | 34,5 | 57 |
Подробные вычисления:
d = 1:
$$2d = 2 \cdot 1 = 2$$
$$3d - 1 = 3 \cdot 1 - 1 = 3 - 1 = 2$$
$$1,5(3d - 1) = 1,5 \cdot 2 = 3$$
d = 8:
$$2d = 2 \cdot 8 = 16$$
$$3d - 1 = 3 \cdot 8 - 1 = 24 - 1 = 23$$
$$1,5(3d - 1) = 1,5 \cdot 23 = 34,5$$
d = 13:
$$2d = 2 \cdot 13 = 26$$
$$3d - 1 = 3 \cdot 13 - 1 = 39 - 1 = 38$$
$$1,5(3d - 1) = 1,5 \cdot 38 = 57$$
Ответ: см. таблицу