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几何模版：构造全等三角形证明线段相等
Author:
lansesorry
GeoGebra
New Resources
直線的斜率：水平變化 & 鉛垂變化
活动三：应用性质
中华人民共和国国旗
正方形雪花图案
折扣
Discover Resources
複息的威力
練習1
可動多邊形
Probability of forming a triangle
moon
Discover Topics
Probability
Arithmetic
Upper and Lower Sum or Riemann Sum
Sequences and Series
Cosine