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happy birthday

Author:李春培

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兩位數除以一位數（一）
兩位數加法
判斷球體
近似值：有效數字
兩組對邊相等的四邊形

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三视图
解方程式
Thm8.1
包含除法（整數或分數 ÷ 分數）
有理数与无理数

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Arithmetic Operations
Cuboid
Parabola
Polygons
Scatter Plot

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