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9.1 - 直角座標上的三角比
Author:
W.L. Wong, Albert
GeoGebra
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祖冲之的期望：内棋与外棋
垂直線的斜率
画直线等分三角形的面积
多邊形的面積
兩位數除以一位數（二）
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內心
task 5
四下_認識小數(教師版)
graph of functions
線性變換矩陣（二階）的副本
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Frequency Distribution
Coordinates
Solids or 3D Shapes
Ratios
Tree Diagrams