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根據百分率找數量（一）: 例4
Author:
GeoGebra Institute of Hong Kong
Topic:
Percentages
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双心四边形
撒针估算面积实验
龙形曲线-分形龙2
活动三：应用性质
异形操场
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外资知名
test01
奠基
对数函数图像随底数变化的规律
奔马
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Parallelogram
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