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梯形面积2
Author:
杨华
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
第八周作业
球体的体积推导
三位數除以一位數（二）
直線的斜率
Discover Resources
電子幾何條
一點點小範例
圓與圓柱
尺規作圖
比較角的大小二
Discover Topics
Constructions
Congruence
Statistical Characteristics
Fractal Geometry
Logarithm