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三角形的三条高
Author:
刘文明
Topic:
Triangles
GeoGebra
New Resources
算柱 (兩位數)
兩位數除以一位數（二）
第八周作业
兩組對邊相等和有直角的四邊形
異分母分數減法
Discover Resources
內次擺線
解數學題目
費氏螺旋 (基本作圖)
平移練習
圆锥的侧面展开图3D动画的副本
Discover Topics
Polygons
Calculus
Similar Triangles
Equations
Quadratic Functions