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Kieu Ngoc

Kieu Ngoc

Member Since 01-03-2016
Offline Last Active 17-06-2016 - 07:29
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#617910 $Cho x^{2}+y^{2}+z^{2}+t^{2}...

Posted by Kieu Ngoc on 01-03-2016 - 20:58

$Cho x^{2}+y^{2}+z^{2}+t^{2}\leq 1 CMR : \sqrt{(x+z)^{2}+(y-z)^{2}}+\sqrt{(x-z)^{2}+(y+t)^{2}}\leq 2$




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