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4.360 Представьте в виде рационального числа \( \frac{p}{q} \) значение выражения: \( \begin{array}{lll}\text { а) }-\frac{1}{8}+\frac{3}{16} ; & \text { в) }-\frac{4}{9} \cdot 1 \frac{7}{11} ; & \text { д) }-1,25:(-0,25) \\ \text { б) } 4,8-5,9 ; & \text { г) }-4,8 \cdot(-1,4) ; & \text { е) }-1,6:(-1,2)\end{array} \)

Ask by Bird Evans. in Russia
Mar 17,2025

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- а) \( \frac{1}{16} \) - б) \( \frac{-11}{10} \) - в) \( \frac{-8}{11} \) - г) \( \frac{168}{25} \) - д) \( 5 \) - е) \( \frac{4}{3} \)

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Давайте разберём каждое выражение и представим их в виде рациональных чисел. а) \(-\frac{1}{8}+\frac{3}{16}\): Сначала приведём к общему знаменателю. \( \frac{3}{16} = \frac{3 \times 2}{16 \times 2} = \frac{6}{32} \) и \(-\frac{1}{8} = -\frac{4}{32}\). Таким образом, \(-\frac{1}{8}+\frac{3}{16} = -\frac{4}{32} + \frac{6}{32} = \frac{2}{32} = \frac{1}{16}\). б) \(4,8-5,9\): Преобразуем в дроби: \(4,8 = \frac{48}{10}\) и \(5,9 = \frac{59}{10}\). Тогда: \( \frac{48}{10} - \frac{59}{10} = \frac{48 - 59}{10} = \frac{-11}{10}\). в) \(-\frac{4}{9} \cdot 1 \frac{7}{11}\): Преобразуем смешанное число: \(1 \frac{7}{11} = \frac{11 + 7}{11} = \frac{18}{11}\). Затем: \( -\frac{4}{9} \cdot \frac{18}{11} = -\frac{4 \cdot 18}{9 \cdot 11} = -\frac{72}{99} = -\frac{8}{11}\) (после сокращения). г) \(-4,8 \cdot(-1,4)\): Преобразуем в дроби: \(-4,8 = -\frac{48}{10}\) и \(-1,4 = -\frac{14}{10}\). Тогда: \( -\frac{48}{10} \cdot -\frac{14}{10} = \frac{48 \cdot 14}{100} = \frac{672}{100} = \frac{168}{25}\) (после сокращения). д) \(-1,25:(-0,25)\): Преобразуем в дроби: \(-1,25 = -\frac{125}{100}\) и \(-0,25 = -\frac{25}{100}\). Тогда: \(-\frac{125}{100} : -\frac{25}{100} = \frac{125}{25} = 5\). е) \(-1,6:(-1,2)\): Преобразуем в дроби: \(-1,6 = -\frac{16}{10}\) и \(-1,2 = -\frac{12}{10}\). Тогда: \(-\frac{16}{10} : -\frac{12}{10} = \frac{16}{12} = \frac{4}{3}\) (после сокращения). Таким образом, получаем следующие значения: а) \(\frac{1}{16}; \, б) \frac{-11}{10}; \, в) \frac{-8}{11}; \, г) \frac{168}{25}; \, д) 5; \, е) \frac{4}{3}\).

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