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平行線的斜率
Author:
Anthony OR 柯志明
Topic:
Difference and Slope
GeoGebra
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柱體建築師
算柱 (兩位數)
拼砌四邊形
兩位數除以一位數（二）
四邊形的特性
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「相似三角形」任务4
題三
example 1_sun
GGB1
cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
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Histogram
Surface
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Intersection
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