Question

Помогите пожалуйста с примерами

Answer 1

Решение:

$1) 9(7x - 6) - 18x = 63x - 54 - 18x = 45x - 54\\\\2) 7a - 6(19 - a) = 7a - 114 + 6a = 13a - 114\\\\3) 0,8(6x - 2) + 1,6(x-4) = 4,8x - 1,6 + 1,6x + 6,4 = 6,4x + 4,8$

$4) 2,8(5b - 6a) - (7b -8a) \cdot 1,2 = 14b - 16,8a -8,4b + 9,6a = 5,6b -7,2a\\\\5) -(-4,9 - 5,8c) - (3,1c -5,6) = 4,9 + 5,8c - 3,1c + 5,6 = 2,7c +10,5\\\\6) \frac{8}{9}(1\frac{1}{4}a - \frac{3}{4}b) - \frac{7}{30}(4\frac{2}{7}a-8\frac{4}{7}b) = \frac{8\cdot5}{9\cdot4}a - \frac{8\cdot3}{9\cdot4}b - \frac{7\cdot30}{30\cdot7}a + \frac{7\cdot60}{30\cdot7}b = \frac{10}{9}a - \frac{2}{3}b - a + 2b = \\\\\frac{1}{9}a+1\frac{1}{3}b$