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形心
Author:
Jensen Wong
Topic:
Centroid or Barycenter
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
錐體建築師
四邉形 (四年級) 教師版
三位數除以一位數（一）
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How to draw a pentagon with ruler and compasses?
test
Test
深圳2018 22
制作模版
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Cone
Right Triangles
Tree Diagrams
Subtraction
Perimeter