Toán Lớp 9: `ab+bc+ca=3abc` tìm max `1/(2a^2+b^2)+1/(2b^2+c^2)+1/(2c^2+a^2)` -

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Toán Lớp 9: `ab+bc+ca=3abc` tìm max `1/(2a^2+b^2)+1/(2b^2+c^2)+1/(2c^2+a^2)`