Question

27 Efectuați: b
$\frac{2}{50} + \frac{4}{50} + \frac{6}{50} + ... + \frac{48}{50}$
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Answer 1

$2( \frac{1}{25} + \frac{2}{25} + \frac{3}{25} + ... + \frac{24}{25}) = \\ = 2( \frac{(1 + 2 + 3 + ... + 24)}{25} ) = \\ = 2( \frac{24 \times 25}{25} ) = \\ = 2( \frac{600:2}{25} ) = \\ = 2 \times \frac{12}{1} = \\ = 24$

Answer 2

Sper ca te-am ajutat !