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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
sanjiaohanshu
算柱 (兩位數)
四邊形的特性
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以面積固定平行線軌跡
Add and subtract (binary) 2
廣義三角函數的換算
P4_四下_面積（一）(教師版)
繪畫四邊形
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Terms
Vectors 3D (Three-Dimensional)
Binomial Distribution
Stochastic Process or Random Process