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quadrilaterals 1
Author:
iedc
GeoGebra
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【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
sanjiaohanshu
四邊形的特性
兩組對邊相等和有直角的四邊形
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folding aeroplane
千分位分數
整數乘分數
大小相同串珠
练习及小结
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Geometric Transformations
Mode
Rotation
Definite Integral
Right Triangles