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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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三位數除以一位數（一）
【案例】2018年全国1卷理科12题
錐體建築師
判斷球體
異分母分數減法
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幾何原理
BkD_act15_02c
拋物線6 包絡線法
我的第一个绘本
活工(一)Q1
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Algebra
Stochastic Process or Random Process
Cube
Random Experiments
Quadratic Equations