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Learn01
Author:
June Guam
GeoGebra
三角形ABC，E、F分别是AB、AC的中点，通过E、F分别作垂线交于点D。 证明：AD＝BD。
New Resources
第八周作业
小数 的副本
近似值：有效數字
兩組對邊相等的四邊形
三位數除以一位數（一）
Discover Resources
test book
兩線段和圓3
vertex of quadratic function
(004)80201辛宇婕
Angles in Alternate Segment
Discover Topics
Triangles
Reflection
Integers
Expected Value
Derivative