Question

$1)7\frac{9}{14}+1\frac{16}{21} \\\\2)5\frac{7}{8}+9\frac{11}{20}$

Answer 1

Ответ:

1) 9× 17/42

2) 15× 17/40

• Пошаговое объяснение:

1)

$7 \frac{9}{14} + 1 \frac{16}{21} =$

Приведем к общей знаменателю:

$7 \frac{27}{42 } + 1 \frac{32}{42} = \\ \\ = (7 + 1) \times ( \frac{27}{42 } + \frac{32}{42} ) = \\ \\ = 8 \frac{59}{42} = 9 \frac{17}{42}$

2)

$5 \frac{7}{8} + 9 \frac{11}{20} =$

Приведем к общей знаменателю:

$5 \frac{7}{8} + 9 \frac{11}{20} = \\ \\ = 5 \frac{35}{40} + 9 \frac{22}{40} = \\ \\ = 14 \frac{57}{40} = 15 \frac{17}{40}$