Respuesta:
números enteros: a. (-12)-(+21)=-33 b. (-35)-(+39)=-74 ... c. 17-9+(3-12)-[5+(-4)]=-2 d. -3+(-4-2)+[-7-(4-7)+3]=-10. 12.
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Respuesta:
números enteros: a. (-12)-(+21)=-33 b. (-35)-(+39)=-74 ... c. 17-9+(3-12)-[5+(-4)]=-2 d. -3+(-4-2)+[-7-(4-7)+3]=-10. 12.