Question

Тема " Пропорции "
Реши уравнение :
1. х/15 ( дробь ) = 4/5 ( дробь )
2. 2/х (дробь ) = 6/7 (дробь )
3. 8/9 (дробь ) = х/27 ( дробь )
4. 10/23 (дробь ) = 4/х (дробь )

Answer 1

1.

$\frac{x}{15} = \frac{4}{5} \\ 5x = 60 \\ x = 12$

2.

$\frac{2}{x} = \frac{6}{7} \\ 14 = 6x \\ 6x = 14 \\ x = \frac{7}{3}$

3.

$\frac{8}{9} = \frac{x}{27} \\ 216 = 9x \\ 9x = 216 \\ x = 24$

4.

$\frac{10}{23} = \frac{4}{x} \\ 10x = 92 \\ x = 9.2$