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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
柱體建築師
異分母分數減法
兩位數除以一位數（一）
第八周作业
算柱 (兩位數)
Discover Resources
Trigonometric Ratios: Sine 三角比：正弦
畢氏定理
內切圓滾動有圖更新
angles sum of a triangle 1
认识方程
Discover Topics
Differential Equation
Rectangle
Circumcircle or Circumscribed Circle
Parabola
Difference and Slope