Question

помогите решить!!!пжжжж​

Answer 1

Ответ:

$3(2x + y) - 4(2y - x) = 6x + 3y - 8y + 4x = 10x - 5y \: \: \: \: \: x = 0.2 \: \: \: \: \: y = - \frac{2}{5} \\ 10 \times 0.2 - 5 \times ( - \frac{2}{5} ) = 2 + 2 = 4$

$7( \frac{2}{7}x - \frac{3}{14} y) - 4( \frac{7}{2} x - \frac{3}{8} y) = 2x - \frac{3}{2} y - 14x + \frac{3}{2} y = - 12x \: \: \: \: x = \frac{5}{6} \\ - 12 \times \frac{5}{6} = - 10$

$2(4a - 0.5b) - (3a - 7b) = 8a - b - 3a + 7b = 5a + 6b \: \: \: \: \: \: a = - 0.4 \: \: \: \: \: b = \frac{1}{3} \\ 5 \times ( - 0.4) + 6 \times \frac{1}{3} = - 2 + 2 = 0$

$- 6( \frac{2}{3} a - \frac{1}{6} b) + 4(0.75a - \frac{1}{12} b) = - 4a + b + 3a - \frac{1}{3} b = - a + \frac{2}{3} b \: \: \: \: \: \: a = - 1 \: \: \: \: \: b = \frac{3}{2} \\ - ( - 1) + \frac{2}{3} \times \frac{3}{2} = 1 + 1 = 2$