Question

решите уравнение:

-2/3(6,9с- 1 1/2)+33=3,9с-4,8(5/8с-2,5)​

Answer 1

Ответ:

$- \frac{2}{3} (6.9c - 1 \frac{1}{2} + 33 = 3.9c - 4.8( \frac{5}{8} c - 2.5) \\ - \frac{2}{3} \times ( \frac{69}{10} c - \frac{1}{2} ) + 33 = 3.9c - \frac{24}{5} \times ( \frac{5}{8} c - \frac{5}{2} \\ - \frac{23}{5} c + \frac{1}{3} + 33 = 3.9c - 3c + 12 \\ - \frac{23}{5} c + \frac{100}{3} = 0.9 c + 12 \\ - \frac{23}{5} c + \frac{100}{3} = \frac{9}{10} c + 12 \\ - 138c + 1000 = 27c + 360 \\ 138c - 27c = 360 - 1000 \\ - 165c = - 640 \\ c = \frac{128}{33}$