Question

решите уравнение...пж​

Answer 1

Ответ:

Решаем при помощи пропорции:

$1) \frac{3x}{4} = \frac{9}{20} \\ 3x \times 20 = 9 \times 4 \\ 60x = 36 \\ x = \frac{36}{60} = \frac{36 \div 6}{60 \div 6} = \frac{6}{10} = 0.6$

$2) \frac{8}{7x} = \frac{24}{35} \\ 8 \times 35 = 7x \times 24 \\ 280 = 168 x \\ 168x = 280 \\ x = \frac{280 \div 7}{168 \div 7} = \frac{40 \div 4}{24 \div 4} = \frac{10 \div 2}{6 \div 2} = \frac{5}{3} = 1 \frac{2}{3} \\ = 1 \frac{2}{3}$