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Calculati suma 4+8+12+........+200

Răspuns :

[tex]\displaystyle 4+8+12+...+200=4(1+2+3+...+50) =4 \cdot \frac{50(50+1)}{2} = \\ \\ =2 \cdot 50 \cdot 51=100 \cdot 51=5100[/tex]