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Verifica daca: 6×(1+2+3+4+..........+24)


Răspuns :

6*(1+2+3+4+.....+24)

1+2+3+4+.....24=

= [(1+24)*24]:2=

= (25*24):2=

=600:2=

=300

=> 6*300= 1.800

Baftă!