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多边形面积计算
Author:
阳光
Topic:
Area
GeoGebra
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三位數除以一位數（一）
異分母分數減法
四邊形的特性
【案例】2018年全国1卷理科12题
直角坐標平面上的旋轉變換
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ex 3
圓錐體內切球
intersection: surface-surface, curve-curve
gjc090c21內切圓的圓心
新手任务绘本
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Definite Integral
Differential Calculus
Line Segment
Rectangle
Symmetry