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Dau coroana
Calculati
a) -7+(-5+5)
b) -4+(4-8
c)-4509+2315+4509
d)123-(117-0)+(-123)+118
e) 135-143-(135-143)+1
f) -6-[2+(-8)+0]

Răspuns :

Codrutalama
-7+0=-7
-4+(-4)= -4-4=-8
-2194+4509=+2315
123-117-123+118=6-123+118=-117+118=1
-8-(-8)+1=-8+8+1=0+1?1
-6-(2-8+0)=-6-(-6)=-6+6=0

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