问题
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1, 9, 7, 27, 13, (), 19, 63 A.25 B.33 C.45 D.54
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4,6,5,7,7,9,11,13,19,21,() A. 27,29 B. 32,33 C. 35,37 D.41,43
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1,9,7,27,13,(),19,63A.25 B.33 C.45 D.54
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4,6,5,7,7,9,11,13,19,21,(),() A.27,29 B.32,33 C.35,37 D.41,43
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[6/(1×7)]-[6/(7×13)]-[6/(13×19)]-[6/(19×25)]-……-[6/(97×103)]= () A.433/567B.
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6,7,19,33,71,() A.127B.130C.137D.140
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