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Posted by trumfc13 on 11-07-2014 - 20:25
Cmr: Nếu $x+y+z=0$ thì $2(x^{5}+y^{5}+z^{5})=5xyz(x^{2}+y^{2}+z^{2})$
Posted by trumfc13 on 11-07-2014 - 20:19
Bài 1: Tìm x; y thỏa mãn : $x^{2}+4y^{2}+z^{2}=2x+12y-4z-14$