问题标题:
几道数列题求解1.2,3,7,16,65,321,()A.4546B.4548C.4542D.45442.11/26/1117/2923/38()3.0,0,6,24,60,120()A.180B.196C.210D.2164.2,3,7,45,2017()A.4068271B.4068273C.4068275D.40682775.2,2,3,4,9,32()A.129B.215C
问题描述:
几道数列题求解
1.2,3,7,16,65,321,()
A.4546B.4548C.4542D.4544
2.11/26/1117/2923/38()
3.0,0,6,24,60,120()
A.180B.196C.210D.216
4.2,3,7,45,2017()
A.4068271B.4068273C.4068275D.4068277
5.2,2,3,4,9,32()
A.129B.215C.257D.283
柯永振回答:
1.A7=2^2+316=3^2+765=7^2+16321=16^2+654546=65^2+3212.1/1、2/4、6/11、17/29、46/76可以看到,第二项的分子为前一项分式的分子+分母,分母为前一项的分母+自身的分子+1.所以答案为:122/1993.B0=0^3-00=1^3-...
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