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选修一P139-9求垂线段中点的轨迹
Author:
jjx01
Topic:
Parabola
GeoGebra
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【案例】2018年全国1卷理科12题
判斷球體
三位數除以一位數（一）
兩位數加法
兩組對邊相等和有直角的四邊形
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豆奶
[問題] 行列式 = 0 的機率
定积分的概念
斜率 - 概念及定義 (2)的副本
錯角---垂直平行綫
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Parallelogram
Distributions
Rectangle
Mathematics
Variance