2. 15,21,29,39,( )
A.51 B.55 C.61 D.65
3. 2,3,4,( ),16,29,54
4. 60,65,( ),16,29,54
A.42 B.24 C.10 D.-1
【答案】D
【答案】D
5. -2,0,4,12,( )
A.20 B.24 C.28 D.32
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