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[洋葱] 手拉手模型
Author:
吴兴海
GeoGebra
New Resources
異分母分數減法
球体的体积推导（优化版）
兩位數除以一位數（一）
祖冲之的期望：内棋与外棋
多邊形的面積
Discover Resources
拋物線與直線的交點
Compare areas by cutting shapes Q2
Protractor-usage
折线匀速动点工具
數值滑桿動畫
Discover Topics
Sphere
Dilation
Limits
Surface
Circle