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2/7 + ( - 7/2) - 3/2 Para quitar parentesis aplicas ley de signos
+ por - = -
2/7 - 7/2 - 3/2 El mcm d los denominadores 7 y 2 es 14
(2 * 2)/14 - (7 * 7)/14 - (3 * 7)/14 =
4/14 - 49/14 - 21/14 =
(4 - 49 - 21)/14 =
(4 - 70)/14 =
- 66/14 = Simplificas sacas mitad
- 33/7
Respuesta.
- 33/7