Ответ:

Пошаговое объяснение:

№1

(8 6/7 + 5 4/5) + 4 1/5 =

8 6/7 + 5 4/5 + 4 1/5 = 8 6/7 + 9 5/5 =
8 6/7 + 10 = 18 6/7

№2

10 13/25 - (7 9/25 + 2 13/25) =
(10 13/25 - 2 13/25) - 7 9/25 =
8 - 7 9/25 = 16/25

Verified answer

1)

[tex](8 \frac{6}{7} + 5 \frac{4}{5} ) + 4 \frac{1}{5} = 8 \frac{6}{7} + 5 \frac{4}{5} + 4 \frac{1}{5} = 8 \frac{6}{7} + 10 = 18 \frac{6}{7} [/tex]

2)

[tex]10 \frac{13}{25} - (7 \frac{9}{25} + 2 \frac{13}{25} ) = 10 \frac{13}{25} - 7 \frac{9}{25} - 2 \frac{13}{25 } = 8 - 7 \frac{9}{25} =\\= 7 \frac{25}{25} - 7 \frac{9}{25} = \frac{16}{25} [/tex]