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三角形三边关系
Author:
许春兰
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
斐波那契螺旋弧线（表格法）
活动三：应用性质
平行線的判定
中华人民共和国国旗
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quadrilaterals 4
a Geogebra file created by the first pre-service teacher
-3/2 ≤ cosα + cosβ + cosγ ≤ 3
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Percentages
Ellipse
Trigonometric Functions
Sine
Intersection