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S0G20 一點到四點的最短距離和
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学用数学
GeoGebra
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【案例】2018年全国1卷理科12题
四邊形的特性
錐體建築師
柱體建築師
【案例】圆柱体内放置一个大球六个小球
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test for fun
math123456
數值滑桿
希式半月形的變形
ggb创作
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Root
Random Experiments
Secant Line or Secant
Right Triangles
Quadratic Equations