Question

Помогите умоляю
- 3 + 1=
  4 

3 - 1
4

Answer 1

$- frac{3}{4} +1=- frac{3}{4} + frac{4}{4} = frac{(4-3)}{4} = frac{1}{4} \ \ frac{3}{4} -1= frac{3}{4} - frac{4}{4} = frac{(3-4)}{4} =- frac{1}{4}$