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三角形外心
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午安你好啊~~
三角形外心
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數加法
畫出對稱圖形
兩位數除以一位數（二）
四邊形的特性
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Rectangle _03
圓錐展開圖
Tangent to a curve at a point
circular motion
江苏省连云港市 2019中考 选择第7题
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Functions
Special Points
Prism
Tree Diagrams
Combinatorics