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问题 选择题
已知数列{an}了前n项和Sn=口n-1，则此数列了奇数项了前n项和是（　　）
A．
1
3
(2n+1-1)		B．
1
3
(2n+1-2）		C．
1
3
(22n-1)		D．
1
3
(22n-2)
答案

∵Sn=2n-0

∴S（n-0）=2（n-0）-0

∴an=Sn-S（n-0）=2（n-0） 而a0=0

∴an=2（n-0）

设奇数项组成数列{bn}

∴bn=22n-2∴{bn}是以0为首项，4为公比的等比数列．

∴Tn=

b0(0-4n)
0-4
=
4n-0
3
=
22n-0
3

故选C．

填空题

2÷5的商用分数表示：______．
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单项选择题

We have already covered the topic of network addresses. The first （） in a block (in classes A，B，and C) defines the network address. In classes A，B，and C，if the hostid is all ls， the address is called a direct broadcast address. It is used by a.（） to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a （） address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A，B，and C.

In classes A，B，and C，an address with all is for the netid and hostid (32 bits) defines a（） address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However，a router will block a packet having this type ofaddress to confine the broadcasting to the （） network. Note that this address belongs to class E.

It is used by a.（） to send a packet to all hosts in a specific network.

A．router

B．switch

C．hub

D．firewall
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