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拉伸平行四边形，面积变化
Author:
吕玉雷
GeoGebra
New Resources
兩組對邊相等的四邊形
拼砌四邊形
判斷球體
兩位數除以一位數（二）
兩位數加法
Discover Resources
semicircle
菱形
Similar triangles reasons
arithmetic operation
资料共享每日一题
Discover Topics
Conditional Probability
Pie Chart or Circle Chart
Frequency Distribution
Linear Functions
Mathematics