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餘弦定理
Author:
yuchengda
GeoGebra
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兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
異分母分數減法
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分數乘法的副本
B3_1-5_互動例6
三節棍
Tangent from an external point
圆与圆的位置关系
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Tangent Line or Tangent
Limits
Fractal Geometry
Arithmetic
Sequences and Series