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德·拉·希尔(de la hier)定理
Author:
沈翔
GeoGebra
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【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
找出對稱軸
球體建築師
Discover Resources
測試
Congruent Triangles
拋物線
test1
一个周期内的正弦曲线
Discover Topics
Median Value
Quadrilaterals
Exponent
Geometric Transformations
Hypothesis Testing