Question

Номер 1,под буквой б уравнение

Answer 1

$frac{2}{9}(0,45-2,7y) -frac{2}{17}(0,51-3,4y) = 0,16\\frac{2}{9}(frac{9}{20} - frac{27}{10}y) - frac{2}{17}(frac{51}{100} - frac{17}{5}y) = 0,16\\frac{1}{10} - frac{3}{5}y - frac{3}{50} + frac{2}{5}y = frac{16}{100}\\frac{5}{50} - frac{3}{5}y - frac{3}{50} + frac{2}{5}y = frac{16}{100}\\frac{2}{50} - frac{3}{5}y + frac{2}{5}y = frac{16}{100}\\frac{1}{25} - frac{1}{5}y = frac{16}{100}\\frac{1}{25} - frac{1}{5}y = frac{4}{25}$

$-frac{1}{5}y = frac{4}{25} - frac{1}{25}\\-frac{1}{5}y = frac{3}{25}\\y = -frac{5*3}{25}\\y = -frac{3}{5}\y = -0,6$

Ответ: -0,6