5.83 Раскройте скобки: a) (a + c - n) ⋅ 5; б) 7 ⋅ (x - y - z); в) -1,2 ⋅ (s - b - c); г) (3x - 5 + 4k) ⋅ (-3); д) (4a - 6c + z) ⋅ (-1); e) (m + k - 9 - n) ⋅ a.

Решение:

1. а) \( (a + c - n) \cdot 5 = 5a + 5c - 5n \)
2. б) \( 7 \cdot (x - y - z) = 7x - 7y - 7z \)
3. в) \( -1,2 \cdot (s - b - c) = -1,2s + 1,2b + 1,2c \)
4. г) \( (3x - 5 + 4k) \cdot (-3) = -9x + 15 - 12k \)
5. д) \( (4a - 6c + z) \cdot (-1) = -4a + 6c - z \)
6. е) \( (m + k - 9 - n) \cdot a = ma + ka - 9a - na \)