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二次函数y=ax2+k图像描点法
Author:
何嘉驹
GeoGebra
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異分母分數減法
球体的体积推导（优化版）
画直线等分三角形的面积
兩位數除以一位數（一）
兩位數除以一位數（二）
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Bearings 方位
圆锥曲线包络
硬币
橢圓軌跡04
Addition and Subtraction of Directed Numbers (1)
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Statistics
Logic
Linear Equations
Expected Value
Equilateral Triangles