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三角形四心

Author:cyrus

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四邊形的特性
拼砌四邊形
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)

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乘法表的自动练习
二次函数与一元二次方程和一元二次不等式
椭圆的定义
题1
反射原理的副本

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Vectors
Quadratic Functions
Cylinder
Unit Circle
Polynomial Functions

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