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轴对称图形（翻折问题）
Author:
浅蓝色
GeoGebra
New Resources
平行線的判定
中华人民共和国国旗
折扣
第八周作业
第八周作业3
Discover Resources
三角形重心(相關說明)
vector addition and subtraction
圓周 (圖形A)
Ex5D#6
Angle in alt.segment
Discover Topics
Probability
Calculus
Curve Sketching
Expected Value
Equations