Question

Найдите неизвестный член пропорции

Answer 1

Пошаговое объяснение:

$\frac{x}{ \frac{8}{9} } = \frac{3}{4} \\ \frac{9x}{8} = \frac{3}{4} \\ x = \frac{8 \times 3}{4 \times 9} = \frac{2}{3}$

$\frac{x}{2.8} = \frac{5}{7} \\ x = \frac{2.8 \times 5}{7} = 0.4 \times 5 = 2$

$\frac{12}{7} = \frac{9}{x} \\ x = \frac{7 \times 9}{12} = \frac{63}{12} = \frac{21}{4} = 5 \frac{1}{4}$

$\frac{6.5}{5.2} = \frac{x}{8} \\ x = \frac{8 \times 6.5}{5.2} = 8 \times 1.25 =10$

$\frac{4.5}{3.6} = \frac{x}{4} \\ x = \frac{4.5 \times 4}{3.6} = 1.25 \times 4 = 5$

$\frac{15}{4} = \frac{x}{1 \frac{1}{3} } = \frac{x}{ \frac{4}{3} } = \frac{3x}{4} \\ 15 = 3x \\ x = 5$