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2014-08-19T21:20:05+08:00

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491 is not a perfect square so it doesn't have an integer square root. It's square root may simply be written as  \sqrt{491} and is approximately equal to 22.159.
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2014-08-19T21:57:00+08:00

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22.158 or 22.159. theres no exact square root on that digits
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