问题 解答题
先化简,再求值:(4x-2x2+
1
2
x2)-(x+3x2-2x3)-5.其中x=-2.
答案

原式=-x2+3x+5,

把x=-2代入得-(-2)2+3×(-2)+5=-11.

故答案为-11.

阅读理解

阅读理解。

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填空题

如图1所示,一台Cisco3500系列交换机上连接2台计算机,它们分别划分在VLAN10(ID号为10)和VLAN1(ID号为11)中。交换机的千兆以太网端口(g0/1)连接一台路由器,使2个VLAN之间能够通信,交换机管理地址为167.11.45.2/24,默认路由地址为167.11.45.1/24。

请阅读以下交换机的配置信息,并补充下面空白处的配置命令或参数,按题目要求完成交换机的配置(注:填写答案时,配置语句的关键字要求拼写完整)。

Switch-3548>enabel

Password:***********

Switch-3548#

Switch-3548# configure terminal

Switch-lib(config)# hostname Switch-lib

Switch-lib(config)#interface vlan 1

Switch-lib(config-if)#no shutdown

Switch-lib(config-if)#ip address(1)配置交换机管理地址

Switch-lib(config—if)#exit

Switch-lib(config)# ip default-gateway 167.11.45.1

Switch-lib(config)# vtp domain 1ib

Switch-lib(config)# vtp mode transparent

Switch-lib(config)#exit

Switch-lib#vlan data

Switch-lib(vlan)# vlan(2) 建立VLAN10

…… 建立VLAN11(省略)

Switch-lib(vlan)# exit

Switch-lib# configure terminal

Switch-lib(config) #interface f0/1

Switch-lib(config-if) #no shutdown

Switch-lib(config-if) #switchport(3)为端口f0/1分配VLAN

Switch-lib(config-if) #exit

Switch-lib(config) #interface g0/1

Switch-lib(config-if) #switchport (4)设置VLAN trunk模式

Switch-lib(config-if) #switchport trunk encapsulation dotlq

Switch-lib(config-if) #switchport trunk (5) 配置允许中继的VLAN

Switch-lib(config-if) #exit

Switch-lib(config) #exit

Switch-lib #

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