Question

ДАЮ 100 БАЛЛОВ СРОЧНО НУЖНО РЕШЕНИЕ!!!
ЗАДАНИЕ 13!!!

Answer 1

А)

$7 \frac{1}{2} \div 4 \frac{1}{2} = x \div \frac{3}{25} \\ \frac{15}{2} \div \frac{9}{2} = x \times \frac{25}{3} \\ \frac{15 \times 2}{2 \times 9} = \frac{25x}{3} \\ \frac{5}{3} = \frac{25x}{3} \\ 25x \times 3 = 5 \times 3 \\ 25x = 5 \\ x = \frac{5}{25} = \frac{1}{5}$

Б)

$\frac{y - 5}{6} = \frac{4}{3} \\ (y - 5) 3 = 6 \times 4 \\ 3y - 15 = 24 \\ 3y = 24 + 15 \\ 3y = 39 \\ y = \frac{39}{3} = 13$

В)

$\frac{5}{6} = \frac{15}{2x - 3} \\ 5(2x - 3) = 6 \times 15 \\ 10x - 15 = 90 \\ 10x = 90 + 15 \\ 10x = 105 \\ x = \frac{105}{10} = \frac{21}{2} = 10 \frac{1}{2}$

Г)

$\frac{24}{x + 2} = \frac{1}{5} \\ x + 2 = 24 \times 5 \\ x + 2 = 120 \\ x = 120 - 2 \\ x = 118$

Д)

$\frac{2}{5} = \frac{6}{x + 3} \\ 2(x + 3) = 5 \times 6 \\ 2x + 6 = 30 \\ 2x = 30 - 6 \\ 2x = 24 \\ x = \frac{24}{2} = 12$

Е)

$12 \div \frac{4}{5} x = 20 \div \frac{1}{4} \\ 12 \times \frac{5}{4} x = 20 \times \frac{4}{1} \\ \frac{12 \times 5}{4} x = 20 \times 4 \\ 3 \times 5x = 80 \\ 15x = 80 \\ x = \frac{80}{15} = \frac{16}{3} = 3 \frac{1}{3}$