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F6 數學 2.4 等比數列的無限項之和: 2.求無限項之和、首項、公比例題

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F6 數學 2.4 等比數列的無限項之和: 1.無限的概念、無限項求和公式

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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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