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示范卷
Author:
项剑文
Topic:
Geometry
GeoGebra
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直線的斜率
球体的体积推导
多邊形的面積
祖冲之的期望：内棋与外棋
空间中两直线的位置关系
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动态展示圆面积的构成
定积分的概念（移动端）
第四冊4-1習題8(1)
Indices 5
三角形的三线
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LCM and GCD
Logarithmic Functions
Correlation
Piecewise Functions
Integers