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finding r

Author:kidmancmw

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平行線的斜率
斜率的值
垂直線的斜率
兩位數除以一位數（二）
圓的切線方程

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正9邊形
PMC 2018-19
棱柱
西图对
完全图及其变形

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Isosceles Triangles
Means
Mathematics
Parametric Curves
Congruence

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