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Efectuati urmatoarea suma
Gaus:
2+4+6+.............+50


Răspuns :

=2(1+2+3+....+25)=2x25x26:2=650
2+4+6+....+50=
=2(2+4+6+....+50)=
=2x25x(25+1):2=
=2x25x26:2=
=1300:2=
=650