Предмет: Математика, автор: okeanova2002

пожаоуйста 3 задача

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Ответы

Автор ответа: jekadva

x----времени занял русский
$\frac{3}{4} x$ ----математика
$\frac{3}{4}x* \frac{7}{6} = \frac{7}{8}x$ ----устое
$x+ \frac{3}{4}x+ \frac{7}{8} x=2,8 \\ \frac{21}{8} x= 2,8 \\ x= \frac{28}{10} * \frac{8}{21} \\ x= \frac{16}{15} =1 \frac{1}{15}$
$1 \frac{1}{15}$ ч занял русский
$\frac{3}{4} * \frac{16}{15} = \frac{4}{5}$ ч заняла математика
$\frac{7}{8} * \frac{16}{15} = \frac{14}{15}$ ч заняли устные задания

dima2001krasno: не очень правильный ответ

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