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问题 解答题

解方程：3(x-5)2=2(5-x)                         

答案

3（x﹣5）2+2（x﹣5）3=0，

（x﹣5）2[3+2（x﹣5）]=0，

∴（x﹣5）2=0或3+2（x﹣5）=0，

∴x1=x2=5，x3=．

先把方程右边的项移到左边，然后把方程左边因式分解得到（x﹣5）2[3+2（x﹣5）]=0，把方程转化为一个一元二次方程和一个一元一次方程，然后分别解方程即可．

选择题

近代以来，英德两国通过不同方式，先后确立了君主立宪制。以下对两国政体相同点的叙述，正确的是（   ）

A．君主为国家最高元首

B．内阁首脑对君主负责

C．议会是国家权力中心

D．带有鲜明的专制色彩
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单项选择题

The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The（1）of passing through each network is the same; it is one（2）count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required.A（3）through a network can have different costs (metrics). For example, if maximum（4）is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum（5）is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.

4（）

A．1atency

B．throughput

C．utilization

D．jitter
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