Помогите решить пожалуста.

1 не знаю

$2) \frac{x}{2} + \frac{3x - 2}{5} = 4 | \times 10| \\ 5x + 2(3x - 2) = 40 \\ 5x + 6x - 4 = 40 \\$

$11x - 4 = 40 \\ 11x = 40 + 4 \\ 11x = 44 \\ x = 44 \div 11 \\ x = 4$

$6x - 4x = 3(3x + 11) \\ 2x - 9x - 33 = 0 \\ - 7x - 33 = 0 \\ - 7x = 0 + 33 \\ - 7x = 33$

$x =33 \div ( - 7) \\ x = - \frac{33}{7} = - 4 \frac{5}{7}$

$a) \sqrt{144 \times 16} = 12 \times 4 = 48 \\ b) \frac{5 \times 2}{9} = \frac{10}{9} = 1 \frac{1}{9}$

$v) \frac{3 \times 4}{16} = \frac{12}{16} = \frac{6}{8} \\ g) \frac{2 \times 11}{12} = \frac{22}{12} = 1 \frac{10}{12} = 1 \frac{5}{6}$