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3.4. Aprēkini izteiksmes vērtïbu! \( \begin{array}{ll}\text { a) } \frac{3}{5}: 1,2+3,5 \cdot \frac{4}{5}+\frac{3}{4} \cdot \frac{5}{6}-0,25: \frac{1}{2} & \text { c) } 0,75: \frac{5}{6}+2,5 \cdot \frac{2}{5}-1: 1 \frac{1}{9} \\ \text { b) } 51 \frac{2}{5}+\left(\frac{3}{8}+\frac{7}{20}\right) \cdot 1 \frac{1}{29}-22,68: 0,45 & \text { d) } 2,5:\left(0,75 \cdot \frac{2}{3}-\frac{1}{12}\right)-(-4,4)\end{array} \)

Ask by French Garza. in Latvia
Jan 23,2025

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Answer

**Решение выражений:** **а)** \[ \frac{3}{5} \div 1,2 + 3,5 \cdot \frac{4}{5} + \frac{3}{4} \cdot \frac{5}{6} - 0,25 \div \frac{1}{2} = 3,425 \] **б)** \[ 51 \frac{2}{5} + \left(\frac{3}{8} + \frac{7}{20}\right) \cdot 1 \frac{1}{29} - 22,68 \div 0,45 = 1,75 \] **в)** \[ 0,75 \div \frac{5}{6} + 2,5 \cdot \frac{2}{5} - 1 \div 1 \frac{1}{9} = 1 \] **г)** \[ 2,5 \div \left(0,75 \cdot \frac{2}{3} - \frac{1}{12}\right) - (-4,4) = 10,4 \]

Solution

Рассчитаем значение выражений по пунктам: ### а) \[ \frac{3}{5} \div 1,2 + 3,5 \cdot \frac{4}{5} + \frac{3}{4} \cdot \frac{5}{6} - 0,25 \div \frac{1}{2} \] **Вычисления:** \[ \frac{3}{5} \div 1,2 = \frac{3}{5} \div \frac{6}{5} = \frac{3}{5} \cdot \frac{5}{6} = \frac{15}{30} = 0,5 \] \[ 3,5 \cdot \frac{4}{5} = \frac{7}{2} \cdot \frac{4}{5} = \frac{28}{10} = 2,8 \] \[ \frac{3}{4} \cdot \frac{5}{6} = \frac{15}{24} = 0,625 \] \[ 0,25 \div \frac{1}{2} = 0,25 \cdot 2 = 0,5 \] **Сумма:** \[ 0,5 + 2,8 + 0,625 - 0,5 = 3,425 \] **Ответ:** 3,425 --- ### б) \[ 51 \frac{2}{5} + \left(\frac{3}{8} + \frac{7}{20}\right) \cdot 1 \frac{1}{29} - 22,68 \div 0,45 \] **Вычисления:** \[ 51 \frac{2}{5} = 51 + \frac{2}{5} = 51,4 \] \[ \frac{3}{8} + \frac{7}{20} = \frac{15}{40} + \frac{14}{40} = \frac{29}{40} = 0,725 \] \[ 1 \frac{1}{29} = \frac{30}{29} \approx 1,0345 \] \[ \left(\frac{29}{40}\right) \cdot \frac{30}{29} = \frac{30}{40} = \frac{3}{4} = 0,75 \] \[ 22,68 \div 0,45 = 50,4 \] **Сумма:** \[ 51,4 + 0,75 - 50,4 = 1,75 \] **Ответ:** 1,75 --- ### в) \[ 0,75 \div \frac{5}{6} + 2,5 \cdot \frac{2}{5} - 1 \div 1 \frac{1}{9} \] **Вычисления:** \[ 0,75 \div \frac{5}{6} = 0,75 \cdot \frac{6}{5} = 0,9 \] \[ 2,5 \cdot \frac{2}{5} = 1 \] \[ 1 \div 1 \frac{1}{9} = 1 \div \frac{10}{9} = 0,9 \] **Сумма:** \[ 0,9 + 1 - 0,9 = 1 \] **Ответ:** 1 --- ### г) \[ 2,5 \div \left(0,75 \cdot \frac{2}{3} - \frac{1}{12}\right) - (-4,4) \] **Вычисления:** \[ 0,75 \cdot \frac{2}{3} = \frac{3}{4} \cdot \frac{2}{3} = \frac{6}{12} = 0,5 \] \[ 0,5 - \frac{1}{12} = \frac{6}{12} - \frac{1}{12} = \frac{5}{12} \approx 0,4167 \] \[ 2,5 \div 0,4167 = 2,5 \cdot \frac{12}{5} = 6 \] \[ 6 - (-4,4) = 6 + 4,4 = 10,4 \] **Ответ:** 10,4

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a) Šis izteikums ietver dalīšanu, saskaitīšanu un reizināšanu, tādēļ vispirms jāveic dalīšana un reizināšana. Par 0.25 dalot ar 0.5, iegūstam 0.5, ko tad pieskaitām pie citām darbībām. Paturiet prātā, ka pareizā kārtība ir svarīga, lai nonāktu pie pareizā rezultāta! b) Šajā izteikumā ir gan daļas, gan vērtības, tāpēc vispirms jāpārvērš viss vienādās mērvienībās. Piemēram, 1 1/9 jāizsaka kā improper a fraction, t.i., 10/9. Turpiniet ar saskaitīšanu un reizināšanu, paturot prātā, ka jāpievieno un jāatņem vispirms visiem reizinājumiem!

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