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Member Since 09-12-2013
Offline Last Active 09-12-2013 - 17:16

09-12-2013 - 17:11

CMR

$\frac{1}{\sqrt{2n+1}}>\frac{C_{2n}^{n}}{2^{2n}} $

với mọi n >=1

các bạn làm hộ mình nha thanks

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