Question

aflati x din proporțiile : a) x supra 8= 9 supra 4, b) 12 supra x = 5 supra 6 , c)25 supra 17 = 8 supra x , d) 12 supra 49 = x supra 7 , e) 7 supra 6 = 21 supra 2x , f) 21 supra 5 = 3x supra 10​

Answer 1

Explicație pas cu pas:

a)

$\frac{x}{8} = \frac{9}{4} \\ x = \frac{8 \times 9}{4} \implies\bf x = 18$

b)

$\frac{12}{x} = \frac{5}{6} \\ x = \frac{12 \times 6}{5} \implies\bf x = \frac{72}{5}$

c)

$\frac{25}{17} = \frac{8}{x} \\ x = \frac{17 \times 8}{25} \implies\bf x = \frac{136}{25}$

d)

$\frac{12}{49} = \frac{x}{7} \\ x = \frac{12 \times 7}{49} \implies\bf x = \frac{12}{7}$

e)

$\frac{7}{6} = \frac{21}{2x} \\ x = \frac{6 \times 21}{7 \times 2} \implies\bf x = 9$

f)

$\frac{21}{5} = \frac{3x}{10} \\ x = \frac{21 \times 10}{5 \times 3} \implies \bf x = 14$