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等腰三角形存在性问题
Author:
袁正铎
等腰三角形问题
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
第八周作业
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
Discover Resources
立體幾何
點與圓的關係
Ex5C#6
面積1
同旁內角---不平行綫
Discover Topics
Normal Distribution
Parallelogram
Terms
Difference and Slope
Derivative