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初中八年级奥数：面积与面积法
Author:
王俊辉
拖动A、B、C、D，改变四边形形状
GeoGebra
New Resources
判斷球體
錐體建築師
兩位數除以一位數（一）
異分母分數減法
球體建築師
Discover Resources
五下_分數除法( 教師版)
正弦曲线sin(x)
S3 Trigonometry
圓周公式應用題2的副本
导数定义的动态演示.许兴华数学
Discover Topics
Vectors 2D (Two-Dimensional)
Binomial Distribution
Similar Triangles
Hypergeometric Distribution
Cosine