Question

Calculați a •b, unde: a=1supra2• 3supra4• 5supra6• ... •19supra20

Answer 1

Răspuns:

$a = \frac{1}{2} \times \frac{3}{4} = \frac{3}{8} \\ b = \frac{5}{6} \times \frac{19}{20} = \frac{1}{6} \times \frac{19}{4} = \frac{19}{24} (pt \: ca \: am \: simplificat) \\ iar \: a \times b = \frac{3}{8} \times \frac{19}{24} = \frac{1}{8} \times \frac{19}{8} = \frac{19}{64}$

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