Вычисление выражений:

1. $$2(6x+3) = 2 \cdot 6x + 2 \cdot 3 = 12x + 6$$
2. $$-3(5y-2) = -3 \cdot 5y + (-3) \cdot (-2) = -15y + 6$$
3. $$(6y-1) \cdot 4 = 6y \cdot 4 - 1 \cdot 4 = 24y - 4$$
4. $$2x-3(5x+2) = 2x - 3 \cdot 5x - 3 \cdot 2 = 2x - 15x - 6 = -13x - 6$$
5. $$-4(2b-5)+8b = -4 \cdot 2b + (-4) \cdot (-5) + 8b = -8b + 20 + 8b = 20$$

Ответ:

1. $$12x + 6$$
2. $$-15y + 6$$
3. $$24y - 4$$
4. $$-13x - 6$$
5. $$20$$