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折扣 例2
Author:
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
異分母分數減法
四邉形 (四年級) 教師版
三位數除以一位數（一）
判斷球體
球体的体积推导（优化版）
Discover Resources
Quadratic Equation
Drawing quadrilaterals on the grid or the pinboard
Addition / Subtraction of 3 Directed Numbers
周界
第三周作业效果演示
Discover Topics
Fractal Geometry
Volume
Functions
Difference and Slope
Ellipse