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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
兩位數除以一位數（二）
第八周作业
兩組對邊相等的四邊形
判斷球體
四邉形 (四年級) 教師版
Discover Resources
Area of Triangle_2
立方體截痕
q5-10
邊角關係
Copy of 固定周界的長方形的面積變化
Discover Topics
Exponential Functions
Percentages
Exponent
Line Segment
Trapezium