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tan90
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
拼砌四邊形
球体的体积推导（优化版）
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PMC 2014-15 ans
平面直角坐标系
包絡線
Solid geometry
立體圖形_截面
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Algebra
Reflection
Means
Line Segment
Random Variables