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随机三角形背景
Author:
孟宝兴
GeoGebra
New Resources
畫出對稱圖形
三位數除以一位數（一）
近似值：有效數字
兩位數加法
判斷球體
Discover Resources
(正)長方體
加減併式與估算
Copy of 三角形的面積
三角形综合题
活动三：应用性质
Discover Topics
Normal Distribution
Standard Deviation
Cuboid
Conic Sections
Right Triangles