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根據百分率找數量（一）: 例4
Author:
GeoGebra Institute of Hong Kong
Topic:
Percentages
GeoGebra
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拼砌四邊形
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
畫出對稱圖形
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正n邊形內角與外角
门禁系统
盾牌~~~~
垂直線(方格版)
单位圆画三角函数图像的副本
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Line Segment
Calculus
Matrices
Multiplication
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