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等腰，角度关系
Author:
pjcfs
GeoGebra
New Resources
画直线等分三角形的面积
異分母分數減法
GeoGebra笔记功能体验课件
三位數除以一位數（一）
算柱 (兩位數)
Discover Resources
Primary School Mathematics Collection
垂直1
S1 Ex9Re Q24
第4課
拼圖2
Discover Topics
Quadrilaterals
Tree Diagrams
Solids or 3D Shapes
Percentages
Tangent Function