Răspuns:
a)
[tex] \frac{x}{2} = \frac{25}{5} \\ \\ x = \frac{2 \times 25}{5} = 10 [/tex]
b)
[tex] \frac{8}{x} = \frac{4}{3} \\ \\ x = \frac{3 \times 8}{4} = 6 [/tex]
c)
[tex] \frac{18x}{15} = \frac{x}{5} \\ \\ 90x = 15x \\ \\ x = 0 [/tex]
d)
[tex] \frac{x}{6} = 2 \\ \\ x = 2 \times 6 \\ \\ x = 12[/tex]
e)
[tex] \frac{1}{7} = \frac{3}{x} \\ \\ x = \frac{7 \times 3}{1} = 21 [/tex]
f)
[tex]7 = \frac{x}{3} \\ \\ x = 7 \times 3 \\ \\ x = 21 [/tex]
g)
[tex] \frac{0.2}{0.3} = \frac{x}{9} \\ \\ x = \frac{0.2 \times 9}{0.3} = 6 [/tex]
h)
[tex] \frac{0.(5)}{0.(3)} = \frac{x}{15} \\ \\x = \frac{ \frac{5}{9} \times 15 }{ \frac{3}{9} } = 25 [/tex]
i)
[tex] \frac{3}{6} = \frac{4}{x} \\ \\ x = \frac{6 \times 4}{3} = 8 [/tex]
j)
[tex] \frac{5}{ \frac{1}{7} } = \frac{x}{10} \\ \\ x = 350 [/tex]
