Question

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Answer 1

Răspuns:

a)

$\frac{x}{2} = \frac{25}{5} \\ \\ x = \frac{2 \times 25}{5} = 10$

b)

$\frac{8}{x} = \frac{4}{3} \\ \\ x = \frac{3 \times 8}{4} = 6$

c)

$\frac{18x}{15} = \frac{x}{5} \\ \\ 90x = 15x \\ \\ x = 0$

d)

$\frac{x}{6} = 2 \\ \\ x = 2 \times 6 \\ \\ x = 12$

e)

$\frac{1}{7} = \frac{3}{x} \\ \\ x = \frac{7 \times 3}{1} = 21$

f)

$7 = \frac{x}{3} \\ \\ x = 7 \times 3 \\ \\ x = 21$

g)

$\frac{0.2}{0.3} = \frac{x}{9} \\ \\ x = \frac{0.2 \times 9}{0.3} = 6$

h)

$\frac{0.(5)}{0.(3)} = \frac{x}{15} \\ \\x = \frac{ \frac{5}{9} \times 15 }{ \frac{3}{9} } = 25$

i)

$\frac{3}{6} = \frac{4}{x} \\ \\ x = \frac{6 \times 4}{3} = 8$

j)

$\frac{5}{ \frac{1}{7} } = \frac{x}{10} \\ \\ x = 350$