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两角和与差的余弦、正弦公式(动画1)
Author:
叶卢庆
GeoGebra
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【案例】2018年全国1卷理科12题
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
兩位數加法
找出對稱軸
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Homework2
ex 4
指數函數與多項式函數
向外延伸的多邊形
梯形面積(求上底)
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Geometry
Trigonometry
Limits
Vectors 3D (Three-Dimensional)
Conditional Probability