V
vietphuonga1


cho a,b,c la ba so thuc duong thoa man abc=1.tim GTLN cua bieu thuc
[TEX]\frac1{a^2+2b^2+3}+\frac1{b^2+2c^2+3}+\frac1{c^2+2a^2+3}[/TEX]
[TEX]\frac1{a^2+2b^2+3}+\frac1{b^2+2c^2+3}+\frac1{c^2+2a^2+3}[/TEX]
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