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"拈" 類遊戲之一-搶21遊戲 The 21 game
Author:
侯杰材
GeoGebra
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兩組對邊相等的四邊形
球体的体积推导（优化版）
異分母分數減法
【案例】2013年安徽高考15题
第八周作业
Discover Resources
內切圓半徑證明
兩個圓的中點軌跡
作业1
圆的面积展开的副本
DANDELIN
Discover Topics
Indefinite Integral
Parallelogram
Conic Sections
Continuity
Rectangle