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多边形对角线
Author:
张英华
GeoGebra
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第八周作业
兩組對邊相等和有直角的四邊形
拼砌四邊形
三位數除以一位數(二)
三位數除以一位數(一)
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八年级数学竞赛之比例线段
VV圓
幾何鋪磚 3, 4, 6 邊形
三節棍
橢圓1-同心圓法
Discover Topics
Subtraction
Line Segment
Indefinite Integral
Similar Triangles
Interest Calculation