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三棱锥的体积推导的副本
Author:
孙广仁
GeoGebra
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【案例】2018年全国1卷理科12题
漂亮的摇摆曲线
三位數除以一位數（一）
祖冲之的期望：内棋与外棋
平行線的斜率
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三角形的面積
球內接正方體
學資p.14第9題
Test1
夾擠定理 (The Squeeze Theorem)
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Triangles
Difference and Slope
Sequences and Series
Parallelogram
Solids or 3D Shapes