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signos iguales = positivo
signos diferentes = negativo
+ × + = +
- × - = +
+ × - = -
- × + = -
teniendo claro esto resolvemos el ejercicio:
(15+(3+10-7+1)-(5-8-(+9))
aplicamos la ley de los signos:
(15+3+10-7+1)-(5-8-9)=
=(15+3+10-7+1)-5+8+9=
=15+3+10-7+1-5+8+9=
=34