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Calculeaza desfiintand parantezele :
a) [(3-2+1)-(-5-4+7)-(+4)]-[7+(-3-2+4)-(-4+3+1)+(-6)] = ?
b) -5-{-1+[-3(-5-2)]-[-4-(-7-4) +(-3+7)]-2} = ?
c)4+{1-[2-(-5-1)+(-3+2)][-2+(2-5)-(-3+5)]-4} = ?
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Răspuns :

a) [(3-2+1)-(-5-4+7)-(+4)]-[7+(-3-2+4)-(-4+3+1)+(-6)] =
[(1+1)-(-9+7)-4]-[7+(-1+4)-(-1+1)-6]=
[2-(-2)-4]-[7+3-0-6]=
(2+2-4)-(10-6)=
(4-4)-4=0-4=-4

b) -5-{-1+[-3(-5-2)]-[-4-(-7-4) +(-3+7)]-2} = 
-5-{-1+[-3·(-7)]-[-4-(-11)+4]-2}=
-5-{-1+21-[-4+11+4]-2}=
-5-{+20-(7+4)-2}=
-5-{+20-11-2}=
-5-{9-2}=
-5-7=-12

c)4+{1-[2-(-5-1)+(-3+2)][-2+(2-5)-(-3+5)]-4} = 
4+{1-[2-(-6)-1][-2-3-2-4]-4]=
4+{1-(2+6-1)(-11)-4}=
4+{1-(+7)(-11)-4}=
4+{1+77-4}=
4+(78-4)=
4+74=78

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