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Cho a,b,c>0, a+b+c=1
Cm: [TEX]\frac{a-bc}{a+bc} +\frac{b-ca}{b+ca} +\frac{c-ab}{a+ab}\leq \frac{3}{2}[/TEX]
Cm: [TEX]\frac{a-bc}{a+bc} +\frac{b-ca}{b+ca} +\frac{c-ab}{a+ab}\leq \frac{3}{2}[/TEX]
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