Question

Помогите пожалуйста!
-1/3 + 2 1/5
-1 1/2 - 3 1/9
-3/7 + (1/14 - 2/21)
(2/5 - 9/10) + 1/3
(2/7 - 1/14) - 5/21
/-черта дроби

Answer 1

1/15

-5/6

-19/42

-1/6

-1/42

Answer 2

$\frac{ - 1}{3} + \frac{21}{5} =58 \\ nok (3 \: 5) = 15 \\ - 1 \times 5 + 21 \times 3 = - 5 + 63 = 58$

$\frac{ - 11}{2} - \frac{31}{9} = - 161\\ nok(2 \: 9) = 18 \\ - 11 \times 9 - 31 \times 2 = - 99 - 62 = - 161$