189. Раскройте скобки:

Решение:

1. \[ 4(5x + 9y - z) = 20x + 36y - 4z \]
2. \[ -6(-a - 8b + 7c) = 6a + 48b - 42c \]
3. \[ (6p - n - 4m) \cdot (-1,6) = -9,6p + 1,6n + 6,4m \]
4. \[ (-2,6a - b + 1,4c) \cdot (-m) = 2,6am + bm - 1,4cm \]
5. \[ -0,7n(7a - 2,1 + 5k) = -4,9an + 1,47n - 3,5nk \]
6. \[ -24\left(\frac{7}{12}x + 0,5y - \frac{5}{6}z - 0,3\right) = -24 \cdot \frac{7}{12}x - 24 \cdot 0,5y + 24 \cdot \frac{5}{6}z + 24 \cdot 0,3 = -14x - 12y + 20z + 7,2 \]