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Tse Sir
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柱體建築師
兩組對邊相等和有直角的四邊形
異分母分數減法
近似值：有效數字
【案例】2018年全国1卷理科12题
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ex 8
二元线性规划的图解法(18.2 例5)
教學媒體10/02
求公切線段長
生日问题
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Integral Calculus
Parallelogram
Coordinates
Cube
Intersection