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Projection of vector in R2
Author:
sealion1215
GeoGebra
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画直线等分三角形的面积
找出對稱軸
柱體建築師
算柱 (兩位數)
四邊形的特性
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Box method for multiplication
ma_test
行星軌跡
複數：正方形內的正方形
雙曲線2--焦點法
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Standard Deviation
Natural Numbers
Congruence
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