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两平面夹角
Author:
刘莹
GeoGebra
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【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
【案例】2018年全国1卷理科12题
三位數除以一位數（一）
判斷球體
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Scheimpflug image
四塊面積
面積
Light reflected in hyperbola的副本
拋物線6--包絡線法
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Distributions
Plane Figures or Shapes
Algebra
Confidence Interval