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半圆的滚动
Author:
孟宝兴
GeoGebra
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【案例】2018年全国1卷理科12题
拼砌四邊形
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
球體建築師
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能量守恆
Difference of Two Cubes
Copy of 固定面積的圖形的周界變化
轨迹
內含正方形的正方形
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Median Value
Numbers
Sine
Area
Triangles