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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
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【案例】2018年全国1卷理科12题
三位數除以一位數（一）
直角坐標平面上的旋轉變換
異分母分數減法
錐體建築師
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這是我的答案
三角柱算體積(可以切開)
congruent (AAA)
黃金矩形
动圆与两(相离)圆外切
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Hypothesis Testing
Dilation
Boxplot
Cosine
Vectors 2D (Two-Dimensional)