Question

Найдите значение выражений

Answer 1

16)
$frac{1}{ frac{1}{3} + frac{1}{7} } = frac{1}{ frac{7}{21} + frac{3}{21} } = frac{1}{ frac{10}{21} } = frac{21}{10} = 2.1$
17)
$frac{1}{ frac{1}{4} + frac{1}{6} } = frac{1}{ frac{6}{24} + frac{4}{24} } = frac{1}{ frac{10}{24} } = frac{24}{10} = 2.4$
18)
$frac{1}{ frac{1}{8} + frac{1}{12} } = frac{1}{ frac{3}{24} + frac{2}{24} } = frac{1}{ frac{5}{24} } = frac{24}{5} = frac{48}{10} = 4.8$
19)
$frac{1}{ frac{1}{2} + frac{1}{3} } = frac{1}{ frac{3}{6} + frac{2}{6} } = frac{1}{ frac{5}{6} } = frac{6}{5} = frac{12}{10} = 1.2$

Answer 2

решение в приложении