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活动三：应用性质
Author:
孟宝兴
GeoGebra
New Resources
判斷球體
兩組對邊相等的四邊形
三位數除以一位數（二）
柱體建築師
兩組對邊相等和有直角的四邊形
Discover Resources
任意角的三角比
擴分、約分及比較大小
梯形面積 Area of Trapezium
shuipen
會暫停的指針
Discover Topics
Random Experiments
Combinatorics
Geometric Transformations
Geometric Distribution
Sequences and Series