Question

Пожалуйста помогите!!! ​

Answer 1

Ответ:

$1) \frac{42}{45} \times \frac{15}{28} + 3 \frac{4}{5} = \frac{14 \times 3 \times 15}{15 \times 3 \times 2 \times 14} + 3 \frac{4}{5} = \frac{1}{2} + 3 \frac{4}{5} = 0.5 + 3.8 = 4.3$

$2)7 \frac{8}{21} - \frac{18}{49} \times \frac{14}{27} =7 \frac{8}{21} - \frac{9 \times 2 \times 7 \times 7}{2 \times 7 \times 9 \times 3} = 7 \frac{8}{21} - \frac{7}{3} = 7 \frac{8}{21} - 2 \frac{1}{3} = 7 \frac{8}{21} - 2 \frac{7}{21} = 5 \frac{1}{21}$

$3)10 \frac{7}{10} + \frac{39}{55} \times \frac{22}{26} = 10 \frac{7}{10} + \frac{3 \times 13 \times 11 \times 2}{5 \times 11 \times 13 \times 2} = 10 \frac{7}{10} + \frac{3}{5} = 10.7 + 0.6 = 11.3$

Answer 2

вот

Где "/ "- сокращение