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银币
Author:
luodeqin@keleshuxue.com
GeoGebra
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三位數除以一位數(二)
兩位數加法
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
判斷球體
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等差數列2
sequence
滑桿動畫示範-2
Hamid Naderi Yeganeh segment3
太陽系的奧秘
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Interest Calculation
Similar Triangles
Distributions
Volume
Triangles