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Add and subtract (binary)
Author:
Ku, Yin Bon (Albert)
GeoGebra
New Resources
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
兩位數除以一位數（一）
球体的体积推导
Discover Resources
n star
利用对称求线段和最值（移动端）
三角函數
教學媒體
Circle
Discover Topics
Arithmetic Mean
Derivative
Optimization Problems
Rhombus
Quadratic Functions