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巧算面积演示
Author:
math Ku
Topic:
Area
GeoGebra
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異分母分數減法
四邊形的特性
球体的体积推导
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
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[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
椭圆的定义的副本
S5 chauyy
hello
fraction compare
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Trapezoid
Geometry
Linear Functions
LCM and GCD
Distributions