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I là tâm đường tròn nội tiếp [TEX]\blue{\Delta ABC[/TEX] . Chứng minh :
[TEX]\blue{\frac{{IA}^2}{bc}+\frac{{IB}^2}{ca}+\frac{{IC}^2}{ab}=1[/TEX]
[TEX]\blue{\frac{{IA}^2}{bc}+\frac{{IB}^2}{ca}+\frac{{IC}^2}{ab}=1[/TEX]
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