Question

знайти значення виразу 6 10/21 - 3 5/14 + 4 5/8
Срочно!!!!! даю пятьдесят баллов​

Answer 1

Ответ:

Пошаговое объяснение:

1) 6. 10/21 - 3. 5/14 =

6. 20/42 - 3. 15/42 =

3. 5/42

2) 3. 5/42 + 4. 5/8 =

3. 20/168 + 4. 105/168 =

7. 125/168

Answer 2

Пошаговое объяснение:

$6 \frac{10}{21} - 3 \frac{5}{14} + 4 \frac{5}{8} = 3 \frac{5}{42} + 4 \frac{5}{8} = 7 \frac{125}{168}$

$1)6 \frac{10}{21} - 3 \frac{5}{14} = \frac{10 + 6 \times 21}{21} - \frac{5 + 3 \times 14}{14} = \frac{136}{21} - \frac{47}{14} = \frac{136 \times 2}{21 \times 2} - \frac{47 \times 3}{14 \times 3} = \frac{272}{42} - \frac{141}{42} = \frac{272 - 141}{42} = \frac{131}{42} = \frac{3 \times 42 + 5}{42} = 3 \frac{5}{42}$

$3 \frac{5}{42} + 4 \frac{5}{8} = 7 + \frac{5}{42} + \frac{5}{8} = 7 + \frac{5 \times 4}{42 \times 4} + \frac{5 \times 21}{8 \times 21} = 7 + \frac{20}{168} + \frac{105}{168} = 7 + \frac{20 + 105}{168} = 7 + \frac{125}{168} = 7 \frac{125}{168}$