Toán Lớp 8: `a^2/(a^2+2abc)`+`b^2/(b^2+2abc`+`c^2/(c^2+2abc`$geq$ `(a+b+c)^2/(a^2+b^2+c^2+6abc)` -

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Toán Lớp 8: `a^2/(a^2+2abc)`+`b^2/(b^2+2abc`+`c^2/(c^2+2abc`$\geq$ `(a+b+c)^2/(a^2+b^2+c^2+6abc)`