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kodama_97


Cho các số a, b, c dương thoả mãn [tex]a+ b+ c= 6[/tex]
Cmr: [tex]\frac{a}{4+b^2}+ \frac{b}{4+c^2}+ \frac{c}{4+a^2} \geq \frac{3}{4}[/tex]
Cmr: [tex]\frac{a}{4+b^2}+ \frac{b}{4+c^2}+ \frac{c}{4+a^2} \geq \frac{3}{4}[/tex]
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