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verificati daca: a) -4+(-2)+3-(-5+7-9+1)=3

Răspuns :

a) -4+(-2)+3-(-5+7-9+1)= -4-2+3+5-7+9-1=-6+3+5-7+9-1=-3+5-7+9-1=2-7+9-1=-5+9-1=4-1=3