V
vuihaybuon


cho a,b,c>0 và a+b+c=1
cmr:[TEX]\frac{a}{a + bc} + \frac{b}{b + ca} + \frac{c}{c + ab} \leq \frac{9}{4}[/TEX]
cmr:[TEX]\frac{a}{a + bc} + \frac{b}{b + ca} + \frac{c}{c + ab} \leq \frac{9}{4}[/TEX]
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