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平行線的斜率2
Author:
Sam Hui
GeoGebra
New Resources
算柱 (兩位數)
柱體建築師
画直线等分三角形的面积
四邊形的特性
兩位數除以一位數（一）
Discover Resources
全等三角形: 重溫
梯形面積---麥田圈
等分例子
slide base
量詞
Discover Topics
Unit Circle
Differential Equation
Set Theory
Bar Chart or Bar Graph
Integers