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Elementary school math
Author:
呂宗錡
Drag E and F to rotate the rectangle RSTU.
GeoGebra
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三位數除以一位數（一）
球體建築師
兩位數除以一位數（一）
找出對稱軸
画直线等分三角形的面积
Discover Resources
阿基米德螺線
數學傳播39卷4期, 平面幾何公式思考
纏繞畫2
正n邊形內角與外角的副本
One less prime number
Discover Topics
Trapezoid
Constructions
Linear Regression
Fractions
Functions