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F.1_Ch5.1A_求百分數

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F.1_Ch5.1A_求百分數

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F.1_Ch5.1B_求部分數量

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F.1_Ch5.1B_求部分數量

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F.1_Ch5.1C_求原數量

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F.1_Ch5.1C_求原數量

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