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1)
Pasas los números mixtos a fraccionarios.
- 2 1/5 =
- ( 2 * 5 + 1)/5 =- ( 10 + 1)/5 = - 11/5
3 3/4 = (3 * 4 + 3)/4 = (12 + 3)/4 = 15/4
Suma.
- 11/5 + 15/4
(- 11 * 4)/(5 * 4) + (15 * 5)/(4 * 5) =
- 44/20 + 75/20 =
(- 44 + 75)/20 =
31/20
Resta.
-11/5 - 15/4 =
- 44/20 - 75/20 =
- 119/20