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perimeter
Author:
Tmw
GeoGebra
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兩組對邊相等的四邊形
兩位數加法
算柱 (兩位數)
【案例】2013年安徽高考15题
三位數除以一位數(一)
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愛上貝氏曲線 (Love for Bezier)
橢圓軌跡01
蜘蛛網
雙曲線3-等軸法
同底等高的三角形面积相等.许兴华数学
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Quadrilaterals
Polygons
Similar Triangles
Arithmetic
Fractions