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巅峰举例题：已知a、b、c为三角形三边，且2/a=1/b+1/c，判断角A
通过变形得出b^2+c^2>a^2，判断角A是锐角。
初中数学三角形集合146/156
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App03:36通过变形得出b^2+c^2>a^2，判断角A是锐角。
App05:22App03:37App07:35App03:52App07:17App06:54App06:38App02:52App06:05App03:36
