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МатематикаВопрос:
2. 20 = 10
Ответ:
$$ 2 \cdot \frac{9}{20} = \frac{2 \cdot 9}{20} = \frac{18}{20} = \frac{9}{10} $$
Ответ: $$
\frac{9}{10}
$$
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