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封閉區域填色
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葉冠和
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基础知识
椭圆的生成
中考 2018 东莞 - 10 改编
中考 2018 東莞-10-T3F
中考 2018 東莞-10-T2
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M05E Rate of Change
Quiz on Indices and Logarithms 指數和對數：測驗
transformation_enlarge/reduction
椭圆展开
滑桿動畫
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Linear Functions
Scalene Triangles
Trapezoid
Line Segment
Ratios
