Question

Пж помогите с математикой

Answer 1

Ответ:

$\frac{2}{3} x + \frac{4}{9} x = 3.2 \\ \frac{2}{3} x + \frac{4}{9} x = \frac{16}{5} \\ 30x +20x = 144 \\ 50x = 144 \\ x = \frac{72}{25} \\ \\ x - 0.2x = \frac{8}{15} \\ 0.8x = \frac{8}{15} \\ 0.8x \div 0.8 = \frac{8}{15} \div 0.8 \\ x = \frac{8}{15} \times \frac{5}{4} \\ x = \frac{2}{3}$