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乘法训练
Author:
玖数
乘法训练
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
三位數除以一位數（二）
兩位數除以一位數（二）
四邊形的特性
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固定周界的長方形的面積變化
切割正八面體
Quiz on Signs of Coefficients of Quadratic Functions 二次函數係數的正負號：測驗
PTCCS2new2
展開圓面積 (講義版)的副本
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Constructions
Optimization Problems
Histogram
Logic
Natural Numbers