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27-03-2013 - 19:58
cho $\triangle ABC$ cân tại A có $\widehat{BAC}$ = 200.cạnh đáy là a, cạnh bên là b.CMR:$a^3+b^3=3ab^2$
26-03-2013 - 19:56
cho $a^5+a=a^3+2$.CMR a6>3