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垂線作圖
Author:
Ray
GeoGebra
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近似值：有效數字
小数 的副本
異分母分數減法
兩位數除以一位數（二）
找出對稱軸
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十字交乘法
題 3
Copy of Quadratic Graph - QESOSASS
梯形
座位奇想(因應疫情 加大座位間隔) 最密堆積
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Terms
Quadrilaterals
Tangent Line or Tangent
Pie Chart or Circle Chart
Mode