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Area_Parallelogram-2
Author:
官長壽(sosolong)
GeoGebra
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常见四边形是否是双心四边形
第八周作业1
直線的斜率：水平變化 & 鉛垂變化
活动三：应用性质
第八周作业3
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折扣 例6
Trigonometry
畢氏定理變裝證明
直線排列1
積分求面積
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Straight Lines
Orthocenter
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Logic