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【练习1】2,3,5,7,( )
A.8 B.9 C.11 D.12
【练习2】12,14,20,38( )
A.46 B.38 C.64 D.92
【练习3】6,7,8,13,15,21,( ),36
A.27 B.28 C.31 D.35
【练习4】74,38,18,10,4,( )
A.2 B.1 C.4 D.3
【练习5】11,12,12,81,13,28,( ),42,15,( )
A.15,55 B.14,60 C.14,55 D.15,60
【练习6】4,5,( ),14, 23,37
A.6 B.7 C.8 D.9
【练习7】84,64,47,33,( ),14
A.12 B.14 C.22 D.24
【练习8】32,23,54,45,( )
A.76 B.67 C.89 D.78
【练习9】343,453,563,( )
A.673 B.683 C.773 D.783
【练习10】0,6,24,60,120,( )
A.186 B.210 C.220 D.226
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