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Cho các số a,b,c,d khác 0.Tính T=x^2011+y^2011+z^2011+t^2011.
Biết x,y,z,t thỏa mãn: x^2010+y^2010+z^2010+t^2010/a^2+b^2+c^2+d^2=x^2010/a^2+y^2010/b^2+z^2010/c^2+t^2010/d^2.
Biết x,y,z,t thỏa mãn: x^2010+y^2010+z^2010+t^2010/a^2+b^2+c^2+d^2=x^2010/a^2+y^2010/b^2+z^2010/c^2+t^2010/d^2.