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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數除以一位數（二）
算柱 (兩位數)
異分母分數減法
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雙曲線的定義
circle
Copy of 平行四邊形
畫三角形 第3題
黎曼和(Riemann Sum)
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Symmetry
Probability
Complex Numbers
Upper and Lower Sum or Riemann Sum
Integers