Question

Срочно дам 55 балов.

Answer 1

7)

$\frac{5}{6} x - \frac{1}{12} x + \frac{1}{2} x = 3 \frac{3}{4} \\ \frac{10}{12} x - \frac{1}{12} x + \frac{6}{12} x = 3 \frac{3}{4} \\ \frac{16}{12} x - \frac{1}{12} x = 3 \frac{3}{4} \\ \frac{15}{12} x = 3 \frac{3}{4} \\ \frac{5}{4} x = 3 \frac{3}{4} \\ x = 3 \frac{3}{4 } \div \frac{5}{4} \\ x = \frac{15 \times 4}{4 \times 5} \\ x = 3$

9)

$2(4a + 3b) - 3(2a + 6b) = \\ 8a + 6b - 6a - 18b = \\ 2a - 12b = - 2(6b - a) = \\ - 2 \times( - 1.9) = 3.8$