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共垂心
Author:
Altmann Cho
GeoGebra
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兩位數除以一位數（一）
異分母分數減法
找出對稱軸
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
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相同圖形的拼砌（有兩組平行線的四邊形）
HOMEWORK
quiz 9.1 2(d)
求三棱锥体积
幂函数
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Parallelogram
Tangent Line or Tangent
Equations
Right Triangles
Trapezoid