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斜率乘积为定值（椭圆、双曲线）
Author:
蔡永志
Topic:
Ellipse
,
Hyperbola
斜率乘积为定值
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第八周作业
美國國旗 (Codex 版)
畫出對稱圖形
判斷球體
國旗 (Claude 版)
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winter vacation homework 6
分數乘法
比較利益
填色問題(封閉圖形)
圆-视觉差
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Difference and Slope
Multiplication
Differential Calculus
Division
Exponent