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垂足三角形
Author:
孟宝兴
垂足三角形
GeoGebra
New Resources
錐體建築師
異分母分數減法
判斷球體
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
Discover Resources
艾薛爾Escher
Arithmetic Series 等差級數
利用对称求线段和最值（移动端）的副本
congruent triangles_provided by Mr Yeung Kar Chun
拼砌四邊形
Discover Topics
Pyramid
Differential Equation
Ellipse
Translation
Diagrams