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27 Efectuați: b
[tex] \frac{2}{50} + \frac{4}{50} + \frac{6}{50} + ... + \frac{48}{50} [/tex]


27 Efectuați B Tex Frac250 Frac450 Frac650 Frac4850 Tex class=

Răspuns :

[tex]2( \frac{1}{25} + \frac{2}{25} + \frac{3}{25} + ... + \frac{24}{25}) = \\ = 2( \frac{(1 + 2 + 3 + ... + 24)}{25} ) = \\ = 2( \frac{24 \times 25}{25} ) = \\ = 2( \frac{600:2}{25} ) = \\ = 2 \times \frac{12}{1} = \\ = 24[/tex]