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同心圓
Author:
倪若雲
GeoGebra
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【案例】2018年全国1卷理科12题
錐體建築師
球體建築師
四邊形的特性
三位數除以一位數（一）
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Simple Interest 單利息
Comparing fractions using number lines and rectangles
Torus
平行四邊形面積的副本
中心对称与轴对称图形.许兴华数学
Discover Topics
Incircle or Inscribed Circle
Mathematics
Ratios
Polygons
Trigonometric Functions