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符成岗

Author:符成岗

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近似值：有效數字
四邊形的特性
sanjiaohanshu
直角坐標平面上的旋轉變換
【案例】2018年全国1卷理科12题

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erwtewt
五邊形與三角形等積
Congruent Triangles
橢圓1--同心圓法
三棱锥的体积推导的副本

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Sequences and Series
Coordinates
Indefinite Integral
Matrices
Fractions

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