5,12,2l,34,53,80,( )
A.115
B.117
C.119
D.121
5,12,2l,34,53,80,( )
A.115
B.117
C.119
D.121
B三级等差数列。 5 12 21 34 53 80 (117)\/\/\/\/\/\/7 9 13 19 27 (37)\/\/\/\/\/2 4 6 8 (10)
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