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111mathA
Author:
Wu Xiao-Ren
GeoGebra
New Resources
判斷球體
兩位數加法
四邉形 (四年級) 教師版
異分母分數減法
錐體建築師
Discover Resources
內心
長方體的表面面積
謝爾賓斯基三角形(Sierpinsky)
等弧對等角
斐波那契螺旋弧线（表格法）
Discover Topics
Right Triangles
Statistical Characteristics
Congruence
Line Segment
Calculus