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2017全国数学II 21题
Author:
wangyiyao
GeoGebra
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活动三：应用性质
平行線的斜率
斜率的值
第八周作业3
百分數及其應用
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判斷球體 5
EX3.18
角度比較
三角形的三个旁切圆.许兴华数学
【折纸】A4纸折四面体
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Orthocenter
Numbers
Centroid or Barycenter
LCM and GCD
Cylinder