Question

Допоможіть!#матеша#!

Answer 1

Ответ:

$1)3(x - 2) = x + 2 \\ 3x - 6 = x + 2 \\ 3x - x = 2 + 6 \\ 2x = 8 \\ x = 4 \\ 2)5 - 2(x - 1) = 4 - x \\ 5 - 2x + 2 = 4 - x \\ - 2x + x = 4 - 5 - 2 \\ - x = - 3 \\ x = 3$

$3)(7x + 1) - (9x + 3) = 5 \\ 7x + 1 - 9x - 3 = 5 \\ 7x - 9x = 5 - 1 + 3 \\ - 2x = 7 \\ x = - 3.5$

$4)3.4 + 2y = 7(y - 2.3) \\ 3.4 + 2y = 7y - 14.6 \\ 2y - 7y = - 14.6 - 3.4 \\ - 5y = - 18 \\ y = 3.6$

$5)0.2(7 - 2y) = 2.3 - 0.3(y - 6) \\ 1.4 - 0.4y = 2.3 - 0.3y + 1.8 \\ - 0.4 + 0.3y = 2.3 + 1.8 - 1.4 \\ - 0.1y = 2.6 \\ y = - 26$

$6) \frac{2}{3} ( \frac{1}{3} x - \frac{1}{2} ) = 4x + 2 \frac{1}{2} \\ \frac{2}{9} x - \frac{2}{6} = 4x + \frac{5}{2} \\ \frac{2}{9} x - 4x = \frac{5}{2} + \frac{2}{6} \\ \frac{2}{9} x - 3 \frac{9}{9} x = \frac{15}{6} + \frac{2}{6} \\ - 3 \frac{7}{9} x = \frac{17}{6} \\ - 3 \frac{14}{18} x = \frac{51}{18} \\ x = - \frac{51}{18 } \times \frac{18}{68} \\ x = - \frac{51}{68}$