【例题】1,3,3,6,7,12,15,( ) A.17 B.27 C.30 D.24
【例题】5,10,26,65,145,( ) A.197 B.226 C.257 D.290
【例题】5,5,14,38,87,( ) A.167 B.168 C.169 D.170
【例题】9,16,36,100,( ) A.144 B.256 C.324 D.361