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根據百分率找數量（一）:例1的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
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【案例】2013年安徽高考15题
斜率的值
垂直線的斜率
祖冲之的期望：内棋与外棋
球体的体积推导
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