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【呂老師的數學教室】如果改變數據，對離差有無影響？#F5 Ch.12.3

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【呂老師的數學教室】框線圖用黎做咩？帶你睇DSE必考問題！#F5 Ch.11.3

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F2 數學 11.8B: 三角恆等式：sin²X+cos²X=1

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