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顶角20°等腰△经典题目，尽显数字之巧，极现图形之妙，叹为观止
顶角20度的等腰三角形经典题目，后续会发布相近类型难度更高额题目，大家可以体会一下这种三角形中蕴含的数学之美
思维拓展-三角及多边形38/92
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