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根據百分率找數量（二）: 例2的副本
Author:
冯圣军
,
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
長方體平面投影 (Codex版)
近似值：有效數字
Earth with coastline
找出對稱軸
Discover Resources
橢圓螺旋
验证2
鉛筆畫圓
C60足球模型展开（双色版）
求切线方程(改进)
Discover Topics
Statistical Characteristics
Similar Triangles
Quadratic Equations
Exponential Functions
Distributions