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等腰，角度关系
Author:
pjcfs
GeoGebra
New Resources
Earth with coastline
AI 訓練教室
四邉形 (四年級) 教師版
長方體平面投影 (Codex版)
近似值：有效數字
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color
funny draw
弦心距比較
测试
回家作業
Discover Topics
Trapezoid
Algebra
Parallelogram
Limits
Expected Value