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面鏡的反射
Author:
dunst kang
GeoGebra
New Resources
算柱 (兩位數)
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
第八周作业
四邉形 (四年級) 教師版
Discover Resources
labyrinth
複合不平等
上色練習
椭圆两个焦点与椭圆上点的连线
「相似三角形」任务5的副本
Discover Topics
Quadrilaterals
Integral Calculus
Confidence Interval
Real Numbers
Pyramid