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happy new year2
Author:
李春培
happy new year2
GeoGebra
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拼砌四邊形
異分母分數減法
柱體建築師
兩位數加法
算柱 (兩位數)
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初中八年级奥数：面积与面积法
繪製一次函數圖形(隨機出題)
固定周界長方形的面積變化（一）
正方体展开图的副本
y=asin(bx+theta)+c
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Integers
Cone
Volume
Expected Value
Rectangle