Question

1) Нужно решить уравнение
2) Выполнить действия
Нужно срочно!!! Помогите.

Answer 1

$1) \: \frac{5}{4} \times ( \frac{8}{3} - y) = \frac{9}{4} \\ \frac{5}{4} \times \frac{8}{3} + \frac{5}{4} \times ( - y) = \frac{9}{4} \\ \frac{5}{1} \times \frac{2}{3} + \frac{5}{4} \times ( - y) = \frac{9}{4} \\ \frac{10}{3} + \frac{5}{4} \times ( - y) = \frac{9}{4} \\ \frac{10}{3} - \frac{5y}{4} = \frac{9}{4} \\ - \frac{5y}{4} = - \frac{10}{3} + \frac{9}{4} \\ - \frac{5y}{4} = - \frac{13}{12} \\ - 5y \times 12 = 4 \times ( - 13) \\ - 60y = - 52 \\ y = - \frac{52}{ - 60} \\ y = \frac{13}{15} .$
$2) \: (11.25 - \frac{41}{12} + 4.3 - \frac{229}{30}) \div \\ \div ( \frac{91}{12} - \frac{35}{6} ) = \\ = \frac{11.25 - \frac{41}{12} + 4.3 - \frac{229}{30} }{ \frac{91}{12} - \frac{35}{6} } = \\ = \frac{60 \times (11.25 - \frac{41}{12} + 4.3 - \frac{229}{30} )}{60 \times ( \frac{91}{12} - \frac{35}{6}) } = \\ = \frac{60 \times 11.25 - 205 + 60 \times 4.3 - }{455 - } \\ \frac{ -458 }{ - 350} = \\ = \frac{675 - 205 + 258 - 458}{105} = \\ = \frac{470 + 258 - 458}{105} = \\ = \frac{728 - 458}{105} = \frac{270}{105} = 2.571$