Выполните умножение одночленов по образцу.

Образец
2x2 y ⋅ \(0,3x3 y2 \) = \(2 ⋅ 0,3\) ⋅ \(x2 ⋅ x3 \) ⋅ \(y ⋅ y2 \) = ... ⋅ ... 5 ⋅ ... 3 = 0,6x5 y3 .
Выполните действия
−0,25a4 b6 ⋅ \(4a3 bc\) = \(− **\.\.\.** ⋅ **\.\.\.** \) ⋅ \( **\.\.\.** 4 ⋅ a3 \) ⋅ \(b6 ⋅ **\.\.\.** \) ⋅ ... = −1 ⋅ a7 ⋅ b7 ⋅ c = −a7b7c.