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F6 數學 2.3 等比數列的首 n 項之和: 求 a,n,r

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F6 數學 2.3 等比數列的首 n 項之和: 求 Sn

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Biological concepts Ch.2(24) - Usage of light microscope

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Biological concepts Ch.2(23) - Microscope-Total magnification

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Biological concepts Ch.2(22) - Using a light microscope

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Biological concepts Ch.2(21) - Microscopic technology

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Biological concepts Ch.2(20) - Cell theory

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Example-Ch7-2-Electron diagrams of ionic compounds

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Example-Ch7-1-Electron diagrams of the first 20 elements

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