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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
找出對稱軸
三位數除以一位數（二）
球體建築師
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觀察軌跡求面積
斜率
gyz3d Hyperbolic Paraboloid
猴子爬樹
y=-3x+6(x>=3)
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Numbers
Upper and Lower Sum or Riemann Sum
Trigonometric Functions
Ellipse
Probability