1.数列{An}满足A1=2,An+1=An/3An+1.则A10=______.
1.数列{An}满足A1=2,An+1=An/3An+1.则A10=______.
2.数列{An}满足:A1=2,An+1=An+n,则A10=_______.
参考答案:1. an=2/[(n-1)*6+1] a10=2/55
2. a10-a9=9 a9-a8=8 a8-a7=7 ……a2-a1=1 加起来 中间消掉a10-a1=(1+2+3+……+9)=45 a10=45+2=47
1.数列{An}满足A1=2,An+1=An/3An+1.则A10=______.
2.数列{An}满足:A1=2,An+1=An+n,则A10=_______.
参考答案:1. an=2/[(n-1)*6+1] a10=2/55
2. a10-a9=9 a9-a8=8 a8-a7=7 ……a2-a1=1 加起来 中间消掉a10-a1=(1+2+3+……+9)=45 a10=45+2=47