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TRIANGLE
Author:
Tina Lin
GeoGebra
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【案例】2013年安徽高考15题
畫出對稱圖形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
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圓錐曲線
領結的角度
三角形三內角和
較複雜的周界問題(二)
六年級
Discover Topics
Intersection
Vectors 2D (Two-Dimensional)
Subtraction
Coordinates
Linear Programming or Linear Optimization