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goodluck
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themanphi
#514138 $\left\{\begin{matrix} x^{3}+2y^...
Posted by
on 20-07-2014 - 16:19
#514129 Chứng minh: $\frac{1}{4-\sqrt{ab}}+\frac{1}{4-\sqrt{...
Posted by
on 20-07-2014 - 15:33
#512136 $\sqrt{1+\sqrt{1-x^{2}}} = x(1+2...
Posted by
on 10-07-2014 - 20:44
