31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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31, 29, 23, (),17, 13, 11A.21B.20C.19D.18[94%]

31, 29, 23, (),17, 13, 11A.21B.20C.19D.18

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76÷4的商是()A.17B.18C.19D.20[94%]

76÷4的商是(  )A.17B.18C.19D.20

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8,11,13,1720,( )   单项选择题   A. 18   B. 20   C. 25   D. 2[94%]

8,11,13,1720,( )  单项选择题  A. 18  B. 20  C. 25  D. 28

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在等比数列{}中,S4=1,S8=3,则a17+a18+a19+a20的值是[ ]A.14B.16C.18D.20[93%]

在等比数列{}中,S4=1,S8=3,则a17+a18+a19+a20的值是[]A.14B.16C.18D.20

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