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保持2:3:4

Author:hjyanghj

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算柱 (兩位數)
兩位數除以一位數（二）
四邊形的特性
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形

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餘弦函數y=cos(x)的泰勒級數
面積
平行四邊形面積
正方形與長方形
Quiz on Addition and Subtraction of Directed Numbers (2)

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Reflection
Constructions
Ellipse
Arithmetic
Quadratic Functions

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