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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
第八周作业
多邊形的面積
Discover Resources
waaachen
CLOCK
UpdateConstruction
区域积分例子
分數與小數
Discover Topics
Pythagoras or Pythagorean Theorem
Intersection
Similar Triangles
Circumcircle or Circumscribed Circle
Curve Sketching