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trapezium

Author:iedc

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拼砌四邊形
兩組對邊相等的四邊形
兩位數除以一位數（一）
近似值：有效數字
三位數除以一位數（二）

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問題集
task5
高中, 直線與點對稱
三角形面積
Addition and Subtraction of Directed Numbers (1)

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Differential Calculus
Arithmetic
Polygons
Planes
Fractions

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