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	Các bình luận về: Đề bài: 1)   Cho tam giác $ABC$ thỏa mãn điều kiện: $max ({h_a},{h_b},{h_c}) &lt; 1$Chứng minh rằng:  khi đó ta có   $S &lt; \frac{{\sqrt 3 }}{3}$2)  Cho tam giác $ABC$ thỏa mãn điều kiện : ${l_a} + {l_b} + {l_c} = \frac{{a + b + c}}{3}(\frac{{ab}}{{a + b}} + \frac{{bc}}{{b + c}} + \frac{{ac}}{{a + c}})$Chứng minh rằng: $R \ge 1$	</title>
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