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海龟爬行
Author:
赵林
GeoGebra
New Resources
兩組對邊相等的四邊形
球體建築師
第八周作业
畫出對稱圖形
三位數除以一位數（一）
Discover Resources
Trigonometric Ratios: Cosine & Tangent 三角比：餘弦和正切
三垂線
test05繪本用
三次函数的极点
(3D) Tasks: Pyramid, Paper folding & Solid of revolution[20170615]
Discover Topics
Root
Straight Lines
Vectors 2D (Two-Dimensional)
Special Points
Quadrilaterals