386. 1) (a+b)·m; 3) (3c-2d)·x;

Решение:

• 1) \( (a+b) \cdot m = am + bm \)
• 2) \( (a-b) \cdot n = an - bn \)
• 3) \( (3c-2d) \cdot x = 3cx - 2dx \)
• 4) \( (-5x+4y) \cdot 2z = -10xz + 8yz \)