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happy planet
Author:
劉瓊如
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
三位數除以一位數（二）
垂直線的斜率
讀磅
平行線的斜率
Discover Resources
齿轮咬合
量筒
Net of prism
认识方程
整数乘法演示
Discover Topics
Real Numbers
Confidence Interval
Reflection
Linear Equations
Integers