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三角形五心與角度關係
Author:
lihsing.zen
Topic:
Mathematics
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三位數除以一位數（一）
判斷球體
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
球體建築師
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happy birthday
畫三角形 題2b
GGB6
直角三角形の三角比
戴德林球
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Optimization Problems
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