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Fresnel and Fraunhofer Diffraktion am Spalt
Author:
chenyunfei
GeoGebra
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祖冲之的期望：内棋与外棋
探究三角形的全等條件
漂亮的摇摆曲线
空间中两直线的位置关系
【案例】2018年全国1卷理科12题
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固定面積的圖形周界變化
乘法
ie 5
畢氏定理
包含除法（整數或分數 ÷ 分數）的副本
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Step Functions
Ratios
Mathematics
Algebra
Integers