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1+2+....+10=
Va rog repede !!!


Răspuns :

1+2+.....+10=
=(10•11):2=
=110:2=55
   
[tex]\displaystyle 1+2+3+ ... +10 = \frac{10 \times 11}{2}= 5 \times 11 = \boxed{55} [/tex]