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領結的角度
Author:
周桂名
角度和不變
GeoGebra
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直線的斜率
多邊形的面積
垂直線的斜率
百分數及其應用
撒针估算面积实验
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waaachen
rabbit
包絡菱形
congruent activity
圆锥截面为圆椭圆双曲线抛物线的动画显示.许兴华数学
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Correlation
Logarithm
Line Segment
Straight Lines
Exponential Functions