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a) (1-7-5)-(6-3+2-4)
= (1-12) -6+3-2+4
= -11 - 8 + 7
= -19 + 7
= -12
b) (6-2-10) : (5-11)
= (6-12) : -6
= -6 : -6
= 1
c) (+5)·(+10) - (+4) · (-20)
= +50 - (-80)
= +50 + 80
= 130
Ejercicio 2)
a)(-3) + (-5) - (+3) + (-2) + (+6)
= -3 - 5 - 3 - 2 + 6
= -13 + 6
= -7
b) (5-2+7) - (3-8-2)
= 3 + 7 - (3-10)
= 10 + 7
= 17
c) [(+12) : (-2)] · [(+3) - (-4)]
= [-6] · [3+4]
= -6 · 7
= -42
Recordemos que :
mas por mas = mas
mas por menos = menos
menos por menos = mas
Saludos desde Venezuela