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S=2+4+6...+106 cum se rezolvă

Răspuns :

[tex]S = 2 + 4 + 6 + ... + 106[/tex]

[tex]S = 2(1 + 2 + 3 + ... + 53)[/tex]

[tex]S = 2 \times \frac{53(53 + 1)}{2} [/tex]

[tex]S = 53(53 + 1)[/tex]

[tex]S = 53 \times 54[/tex]

[tex]S = 2862[/tex]

[tex]Formul \check{a}\:: \: 1 + 2 + 3 + ... + n = \frac{n(n + 1)}{2} [/tex]