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Orthocentre

Author:Big Lee

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兩組對邊相等的四邊形
四邊形的特性
三位數除以一位數（一）
四邉形 (四年級) 教師版
判斷球體

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Addition of 3 Directed Numbers
过圆上一点作切线，三步
拼出三角形
基础知识
Love

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Terms
Statistics
Exponent
Line Segment
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