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陳隆期
GeoGebra
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垂直線的斜率
球体的体积推导
【案例】2018年全国1卷理科12题
多邊形的面積
探究三角形的全等條件
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橢圓拋物面1
circle segment3
验证2
Angle between 2 planes
变化的三角形的旁心.许兴华数学
Discover Topics
Confidence Interval
Vectors
Differential Equation
Bar Chart or Bar Graph
Quadrilaterals