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（一）小数的意义和加减法
Author:
玖玖
GeoGebra
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兩位數加法
多邊形的面積
祖冲之的期望：内棋与外棋
讀磅
探究三角形的全等條件
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直線排列 4
wind
異分母分數加法
認識半徑
Pyth. theorem
Discover Topics
Standard Deviation
Median Line
Binomial Distribution
Quadratic Equations
Pythagoras or Pythagorean Theorem