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下和與上和
Author:
侯杰材
下和與上和
GeoGebra
New Resources
画直线等分三角形的面积
四邊形的特性
GeoGebra笔记功能体验课件
兩位數除以一位數（二）
拼砌四邊形
Discover Resources
Introduction to Rectangular Coordinates 直角坐標簡介
圍周
扇形面積
Measuring areas by placing different shapes
加法002结果(20以内)
Discover Topics
Trapezoid
Differential Equation
LCM and GCD
Angles
Scatter Plot