22) (-2b³+4b-bk)⋅0,3b³k =

22) (-2b³+4b-bk)⋅0,3b³k =

Раскроем скобки:

$$(-2b^3) \cdot (0.3b^3k) = -0.6b^6k$$

$$4b \cdot (0.3b^3k) = 1.2b^4k$$

$$(-bk) \cdot (0.3b^3k) = -0.3b^4k^2$$

Получаем:

$$-0.6b^6k + 1.2b^4k - 0.3b^4k^2$$

Ответ: $$-0.6b^6k + 1.2b^4k - 0.3b^4k^2$$