Question

Выполните действия:



- 7/9 + 8/10=

- 11/12 - 1 2/5= 

15,94 - 15 9/11= 

-8,0(8) - 5 7/9= 

3 3/4 : (-2 11/12)= 

Answer 1

$-cfrac{7}{9}+cfrac{8}{10}=-cfrac{7}{9}+cfrac{4}{5}=cfrac{-35+36}{45}=cfrac{1}{45}\15,94-cfrac{64}{11}=cfrac{797}{50}-cfrac{60}{11}=cfrac{5567}{550}\cfrac{15}{4}:left(-cfrac{35}{12}right)=-cfrac{15cdot 12}{4cdot 35}=cfrac{9}{7}$