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সরল কর: $\left(2^{-1}+5^{-1}\right)^{-1}$

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সরল কর: $\left(2^{-1}+5^{-1}\right)^{-1}$

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$\left(2^{-1}+5^{-1}\right)^{-1}$

$=\left(\frac12+\frac{1}{5}\right)^{-1}$

$=\left(\frac{5+2}{10}\right)^{-1}$

$=\left(\frac{7}{10}\right)^{-1}$

$=\frac{1}{\frac{7}{10}}$

$=1\times\frac{10}{7}$

$=\frac{10}{7}$ [Answer]

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