Question

РЕШИТЕ ПРОПОРЦИИ!
а) 7:х=8:5
б) 13:х=5:8
в) (х-34):3=7:2

Answer 1

Ответ:

$\frac{7}{x } = \frac{8}{5} \\ 8x = 7 \times 5 \\ 8x = 35 \\ x = 4.375$

$\frac{13}{x} = \frac{5}{8} \\ 5x = 13 \times 8 \\ 5x = 104 \\ x = 20.8$

$\frac{x - 34}{3} = \frac{7}{2} \\ 2(x - 34) = 3 \times 7 \\ 2x - 68 = 21 \\ 2x = 21 + 68 \\ 2x = 89 \\ x = 44.5$