Question

решите пожалуйста дам 50 балов

Answer 1

1)

$3(8x + 2.4) - 2(7x + 1.1) = 24x + 7.2 - 14x - 2.2 = 10x + 5$

$1.2(5x - 2.5) - 4(3x - 1.5) = 6x - 3 - 12x + 6 = - 6x + 3$

$1 \frac{1}{9} (3x - 9) - 2 \frac{1}{3} (x - 1.8) = \frac{10 \times 3}{9} x - \frac{10 \times 9}{9} - 2\frac{1}{3} x + \frac{7 \times 9}{3 \times 5} = 3 \frac{1}{3} x - 10 - 2 \frac{1}{3} x + 4.2 = x - 5.8$

$1 \frac{2}{3} (x - 6) - \frac{5}{9} (0.6x - 2.7) = 1 \frac{2}{3} x - \frac{5 \times 6}{3} - \frac{5 \times 3}{9 \times 5} x + \frac{5 \times 27}{9 \times 10} = 1 \frac{2}{3} x - 10 - \frac{1}{3} x + 1.5 = 1 \frac{1}{3} x - 8.5$

2)

$5ab - 15bc + 40abc = 5b(a - 3c + 8ac)$

$44abc + 121ac - 11bc = 11c(4ab + 11a - b)$

3)

$5b - 3(2a - b) = 5b - 6a + 3b = 8b - 6a = - 2(3a - 4b) = - 2 \times 2 = - 4$

$4a +2 (2a - 3b) = 4a + 4a - 6b = 8a - 6b = - 2(3b - 4a) = - 2 \times 2 = - 4$