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12-6-4-多普勒效应4-波源和观察者都运动-尤景汉
Author:
王翚
GeoGebra
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判斷球體
三位數除以一位數（一）
【案例】2018年全国1卷理科12题
畫出對稱圖形
GeoGebra笔记功能体验课件
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Sequence指令練習(二維3)
P.4對稱
PTCCS2new2
导数定义的动态演示.许兴华数学
解三角形（１）
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Calculus
Continuity
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Right Triangles
Matrices