Ответ:
20
[tex]\frac{a \times 2}{10 \times 2} i \frac{b \times 5}{4 \times 5} [/tex]
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Ответ:
20
[tex]\frac{a \times 2}{10 \times 2} i \frac{b \times 5}{4 \times 5} [/tex]