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31,37,25,49,1,()。 A. 58 B. 65 C. 83 D. 97
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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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1,2,13,25,48,()A.92B.90 C.81D.83
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20,25,33,50,()A.74 B.80 C.90 D.92
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1,2,13,25,48,()A.92B.90C.81D.83
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20,20,25,33,50,()。A.74B.80C.90D.92
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1 2 7 13 49 24 343 ( )。 A. 35 B. 69 C. 114 D.