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Resolver.
( 7 - 2 + 4) - ( 2 - 5) + ( - 1) =
(11 - 2) - ( - 3) + ( - 1) =
9 - (- 3) + ( - 1) = Aplicas ley de signos para quitar parentesis
- por - = + y + por - = -
9 + 3 - 1 =
12 - 1 =
11
Respuesta.
11