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翰林數學_2下_CH4-2_特殊平行四邊形有關對角線的性質
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翰林數學
GeoGebra
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正方形雪花图案
三角函数 的副本
异形操场
百分數及其應用
活动三：应用性质
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怪函數之3
rotational symmetry_2
多邊形面積(分割法)
How to derive the value of Pi的副本
指数函数的副本
Discover Topics
Kite
Congruence
LCM and GCD
Similarity Transformation or Similarity
Cuboid