H
halinh_33


CM ABC đều.
1. R=2r
2. [TEX]S=\frac{2}{3}R^2(sin^3A+sin^3B+sin^3C)[/TEX]
[TEX]3.\frac{acosA+bcosB+ccosC}{asinB+bsinC+csinA}= \frac{2p}{9R}[/TEX]
1. R=2r
2. [TEX]S=\frac{2}{3}R^2(sin^3A+sin^3B+sin^3C)[/TEX]
[TEX]3.\frac{acosA+bcosB+ccosC}{asinB+bsinC+csinA}= \frac{2p}{9R}[/TEX]
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