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10. Ko'paytirishni ko'p martali qo'shish bilan almashtirib hisoblang \( \frac{8}{9} \cdot 4 \) Kasrni ko'paytirish xossasidan foydalanib hisoblang. \( \frac{5}{6} \cdot 13 \) \[ \frac{7}{9} \cdot 8 \] \( \frac{3}{4} \cdot 52 \) \( \frac{8}{10} \cdot 7 \)

Ask by Horton Parsons. in Uzbekistan
Feb 22,2025

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Результаты вычислений: 1) \( \frac{8}{9} \times 4 = \frac{32}{9} \) 2) \( \frac{5}{6} \times 13 = \frac{65}{6} \) 3) \( \frac{7}{9} \times 8 = \frac{56}{9} \) 4) \( \frac{3}{4} \times 52 = 39 \) 5) \( \frac{8}{10} \times 7 = \frac{28}{5} \)

Solution

Рассмотрим каждый пример по порядку. 1) Вычислим (8/9)·4 с использованием метода многократного сложения:   (8/9)·4 = (8/9) + (8/9) + (8/9) + (8/9) = 4·(8/9) = 32/9. 2) Найдём (5/6)·13, используя свойство умножения дроби на число:   (5/6)·13 = (5·13)/6 = 65/6. 3) Вычислим (7/9)·8:   (7/9)·8 = (7·8)/9 = 56/9. 4) Вычислим (3/4)·52:   (3/4)·52 = (3·52)/4 = 156/4 = 39. 5) Вычислим (8/10)·7:   (8/10)·7 = (8·7)/10 = 56/10. Сократим дробь, разделив числитель и знаменатель на 2:   56/10 = 28/5. Ответы: 1) 32/9 2) 65/6 3) 56/9 4) 39 5) 28/5

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Keling, ko'paytirishni ko'p martali qo'shish sifatida ko'rib chiqaylik. \( \frac{8}{9} \cdot 4 \) ni hisoblash uchun, 4 ni 9 ta teng qismlarga bo'lib, ularning har biriga \( \frac{8}{9} \) ni qo'shishimiz kerak: \( \frac{8}{9} + \frac{8}{9} + \frac{8}{9} + \frac{8}{9} = \frac{32}{9} \). Endi esa, kasrni ko'paytirish xossasi yordamida \( \frac{5}{6} \cdot 13 \) ni hisoblaymiz. 13 ni 6 ta teng qismlarga bo'lib, ularning har biriga \( \frac{5}{6} \) ni qo'shganimizda, natijani tezda topamiz: 13 ni 5 ta muvozanatli qo'shish orqali, bu \( \frac{65}{6} \) ga teng bo'ladi.

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