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画正弦
Author:
李玲玲
GeoGebra
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漂亮的摇摆曲线
【案例】2013年安徽高考15题
兩位數除以一位數（一）
讀磅
垂直線的斜率
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擺線
五邊形與三角形等積
ggggggg
平行四邊形柱算體積(可以切開)
(004)80201辛宇婕
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Plane Figures or Shapes
Logarithm
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