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扇形動畫
Author:
紀老師
GeoGebra
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球体的体积推导
拼砌四邊形
【案例】2013年安徽高考15题
第八周作业
判斷球體
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waaachen
教學-棱錐摺紙樣式
兩直線的銳夾角
勾股定理介绍及证明
兩條直線垂直應用
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