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Calculati: 3+6+9+...+300

Răspuns :

3+6+9+...+300= 3(1+2+3+...+100) = [tex]3* \frac{100*101}{2}=150*101 = 150*(100+1) = 15000+150 = 15150[/tex]
3+6+9+.........+300= 3×(1+2+3+...+100)= 3×100×101 / 2=15150