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三角形的高與面積
Author:
+x sir
GeoGebra
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柱體建築師
找出對稱軸
球体的体积推导（优化版）
異分母分數減法
【案例】2018年全国1卷理科12题
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立體圖形的截面
anlge at centre twice angle at circumference
Template: 圓周
Rotational Symmetry的副本
圆锥曲线的统一画法.许兴华数学
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Correlation
Function Graph
Rational Numbers
Piecewise Functions
Curve Sketching