a) (+948-1044)×0= -96×0=0
b) -3-10×[362-10×(-24-6)]=
= -3-10×[362-10×(-30)=
= -3-10×(362+300)=
= -3-10×(+662)=-3-6620=
=-6623
c) -10×[100-(100-9)]=-10×
(100-91)=-10×-9=-90
d) -1+5×[(-6)×(-5)-17]-(+8)×(+7)=-1+5×(+30-17)+56=-1+5×(+13)+56=-1+65+56
=+64+56=+120
e) {-3×[-7×(+3)+24+5]+20-4}×(+2)=[-3×(+3+5)+20-4]×
(+2)=-3×(+8)+20-(-24]×(+2)=
(-24+20-4×(+2)=(-8)×(+2)=
=-16.
Exercitiile sunt corecte.
