Question

Найди х из пропорции!
2/x=6/7, x=
3x/1=3/8, x=
0,2/9=x/3, x=
a/3=9/x, x=

/ это дробь
​

Answer 1

$frac{2}{x} = frac{6}{7} \ x = frac{2 times 7}{6} \ x = frac{1 times 7}{3} \ x = 2 frac{1}{3}$

$frac{3x}{1} = frac{3}{8} \ 3x = frac{3}{8} \ x = frac{3}{8} div 3 \ x = frac{3}{8 times 3} \ x = frac{1}{8 times 1} \ x = frac{1}{8}$

$frac{0.2}{9} = frac{x}{3} \ x = frac{0.2 times 3}{9} \ x = frac{2 times 3}{10 times 9} \ x = frac{1 times 1}{5 times 3} \ x = frac{1}{15}$

$frac{a}{3} = frac{9}{x} \ x = frac{3 times 9}{a} \ x = frac{27}{a}$