Ответ:
1) 2 (x - 7y + 3z) = 2 * x - 7y * 2 + 3z * 2 = 2x - 14y + 6z.
2) - 7 (5 - a - 4b) = - 7 * 5 + 7 * a + 7 * 4b = - 35 + 7a + 28b.
3) (c - 8d + 6d) * (- 1 1/5) = (c - 8d + 6d) * (- (1 * 5 + 1)/5) = (c - 2d) * (- 6/5) = - 6/5c + 6/5 * 2d = - 6/5c + 12/5d = - 1.2c + 2.4d.
4) - 0,6x (- 5 + 3m - 1 2/5n) = 5 * 0.6x - 0.6x * 3m + 0.6x * (1 * 5 + 2)/5n = 3x - 1.8xm + 6/10x * 7/5n = 3x - 1.8xm + 21/25xn.
Пошаговое объяснение: