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(111+222+333+...+999):37

Răspuns :

(111+222+333+...+999):37=111×(1+2+3+...+9):37=3×9×10/2=135

se foloseste formula lui Gauss :
1+2+3+....n=n(n+1)/2

(111+222+333+...+999):37=
=4995:37=
=135