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加法(10個一數)
Author:
arist
GeoGebra
New Resources
三位數除以一位數（二）
第八周作业
兩位數除以一位數（二）
找出對稱軸
兩組對邊相等和有直角的四邊形
Discover Resources
测试 = =
切割線性質
Activity 1
動畫基本滑桿
二維
Discover Topics
Real Numbers
Arithmetic Mean
Difference and Slope
Quadrilaterals
Expected Value