Question

Найдите значение выражений

Answer 1

16)
$frac{0.8}{1 + frac{1}{7} } = frac{0.8}{ frac{7}{7} + frac{1}{7} } = frac{0.8}{ frac{8}{7} } = 0.8 times frac{7}{8} = 0.1 times 7 = 0.7$
17)
$frac{0.8}{1 + frac{1}{4} } = frac{0.8}{ frac{4}{4} + frac{1}{4} } = frac{0.8}{ frac{5}{4} } = 0.8 times frac{4}{5} = frac{8}{10} times frac{4}{5} = frac{4}{5} times frac{4}{5} = frac{16}{25} = frac{64}{100} = 0.64$
18)
$frac{1.4}{1 + frac{1}{13} } = frac{1.4}{ frac{13}{13} + frac{1}{13} } = frac{1.4}{ frac{14}{13} } = 1.4 times frac{13}{14} = 0.1 times 13 = 1.3$
19)
$frac{0.9}{ 1 + frac{1}{8} } = frac{0.9}{ frac{8}{8} + frac{1}{8} } = frac{0.9}{ frac{9}{8} } = 0.9 times frac{8}{9} = 0.1 times 8 = 0.8$