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(9 - 13) . ( - 5 +10) - [ 12 :( -3) + ( - 11)] =
( - 4 ) . ( 5) - [ -4 - 11]
-20 - [ -15]
-20 + 15 = 5
Respuesta 5
Utilizamos ley de signos
+ por + = +
- por - = +
+ por - = -
- por + = -