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【323747】2024八年级数学上册 第二章 分式与分式方程综合素质评价 鲁教版五四制

时间:2025-01-15 20:42:56 作者: 字数:9452字
简介:


第二章综合素质评价

题 号

总 分

得 分





一、选择题(每题3分,共30)

1.[2023·烟台龙口市期中]分式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 在实数范围内有意义,则x的取值范围是(  )

A. x=-1 B. x1 C. x≠0 D. x>-1

2.[2023·威海荣成市月考]分式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的最简公分母是(  )

A.2x B.2x4 C.2x(2x4) D.2x(x2)

3.[2023·常州]若代数式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的值是0,则实数x的值是(  )

A.1 B.0 C.1 D.2

4.[2024·日照东港区期末]若分式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ab的值同时扩大到原来的2倍,则分式的值(  )

A.不变 B.扩大到原来的2

C.扩大到原来的4 D.扩大到原来的6

5.化简 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ÷ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> · <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的结果是(  )

A.x2 B.x3 C.x2y4 D. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

6.小敏在做数学作业时,不小心将某式子中除号后边的代数式污染了,即 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ÷*,通过查看答案可知,该式子的计算结果为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,则被污染的代数式*(  )

A. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B.  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> C. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D.  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

7.[2024 潍坊期末新考法整体代入法]已知 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2,则代数式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的值为(  )

A.3 B.3 C.2 D.2

8.[新考向数学文化]《九章算术》中有一道关于古代驿站送信的题目,其白话译文为:一份文件,若用慢马送到900里远的城市,则所需时间比规定时间多1天;若改用快马派送,则所需时间比规定时间少3.已知快马的速度是慢马的2倍,求规定时间.设规定时间为x天,则可列出正确的方程为(  )

A. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

C. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

9.若关于x的方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 有增根x=-1,则2a3的值为(  )

A.2 B.3 C.4 D.6

10.[2023·重庆改编]若关于x的不等式组 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的解集为x<-2,且关于y的分式方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2的解为正数,则所有满足条件的整数a的值之和为(  )

A.10 B.12 C.13 D.15

二、填空题(每题3分,共18)

11.[母题教材P22习题T1]式子- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> a <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 中,分式有    ______.

12.计算: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>     .

13.[2024 临沂期末新视角条件开放题]已知三张卡片上面分别写有6x1x21,从中任选两张卡片,则卡片上的整式能组成的一个最简分式为    .(写出一个分式即可)

14.[2023·衡阳]已知x5,则代数式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的值为    .

15.某厂接到在规定时间内加工1500顶帐篷支援灾区人民的任务,按刚好在规定时间完成任务的工作效率加工了300顶帐篷后,厂家把工作效率提高到原来的1.5倍,于是提前4天完成了任务,则原来每天加工帐篷    .

16.[新视角规律探究题]观察等式: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,将这三个等式的两边分别相加,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

(1)猜想: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>     

(2)分式方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 1的解是    .

三、解答题(72)

17.(6)计算:

(1)[2023·南通] <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> · <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

(2)[2023·襄阳] <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ÷ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .






18.(8)解分式方程:

(1) <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

(2) <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .






19.(8)下面是一道例题及其解答过程的一部分,其中M是单项式.请写出单项式M,并将该例题的解答过程补充完整.

例:先化简,再求值: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,其中a100.

解:原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ……





20.(8)[2023·广东]某学校开展了社会实践活动,活动地点距离学校12km,甲、乙两同学骑自行车同时从学校出发,甲的速度是乙的1.2倍,结果甲比乙早到10min,求乙同学骑自行车的速度.






21.(8)[2023 广州新视角条件开放题]已知a3,代数式:A2a28B3a26aCa34a24a.

(1)因式分解A

(2)ABC中任选两个代数式,分别作为分子、分母,组成一个分式,并化简该分式.






22.(10)已知关于x的分式方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2.

(1)若该分式方程有增根,求m的值;

(2)若该分式方程的解是正数,求m的取值范围.






23.(12)[新考法阅读类比法]阅读下面的材料,然后解答问题.

解方程: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 0.

解:设y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,则原方程化为y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 0

方程两边同时乘y,得y240,解得y2y=-2.

经检验,y2y=-2都是方程y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 0的解.

y2时, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2,解得x=-1

y=-2时, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> =-2,解得x <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

经检验,x=-1x <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 都是原分式方程的解.

原分式方程的解为x=-1x <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

上述这种解分式方程的方法被称为换元法.

问题:模仿上述换元法解方程: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 10.






24.(12)[2023·济宁改编]为加快公共领域充电基础设施建设,某停车场计划购买AB两种型号的充电桩.已知A型充电桩比B型充电桩的单价少0.3万元,且用18万元购买A型充电桩与用24万元购买B型充电桩的数量相等.

(1)AB两种型号充电桩的单价各是多少?

(2)该停车场计划共购买25AB型充电桩,购买总费用不超过26万元,且B型充电桩的购买数量不少于A型充电桩购买数量的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .问:共有哪几种购买方案?哪种方案所需购买总费用最少?




答案及点拨

一、1. B 2. D 3. B 4. C

5. D 【点拨】原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> · <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> · <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> =- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

6. C 【点拨】被污染的代数式* <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ÷ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ·

(1a) <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ·[(a1)] <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

7. B 【点拨】∵ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>2

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2,∴yx2xy

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> =-3.

8. B 【点拨】∵规定时间为x天,

慢马所需时间为(x1)天,快马所需时间为(x3).

又∵快马的速度是慢马的2倍,送信所要走的路程为900里,

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

9. B 【点拨】方程两边都乘x(x1)

3(x1)ax22x(x1)3x

原方程有增根x=-1

x=-1代入上述整式方程,得a3,∴2a33.

10. C 【点拨】 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

解不等式①,得x<-2

解不等式②,得x<- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

关于x的不等式组 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的解集为x<-2

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ≥-2,解得a≤5

方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>2可化为a2y22(y1),解得y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

关于y的分式方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>2的解为正数,

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 0 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>1≠0,解得a>-2a≠1

2a≤5a≠1

所有满足条件的整数a的值之和为-10234513.

二、11.3 12. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  13. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> (答案不唯一)

14. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  【点拨】原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

x5,∴ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

15.100 【点拨】设原来每天加工帐篷x顶,

根据题意,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>4 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

解得x100,经检验,x100是原分式方程的根.

原来每天加工帐篷100.

16.(1) <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  (2)x5

三、17.【解】(1)原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> · <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>1.

(2)原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ÷ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> · <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

18.【解】(1)方程两边同乘x(x5)

2x2x(x5)(x5)2

去括号,得2x2x25xx210x25

移项、合并同类项,得-15x25,解得x=- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

经检验,x=- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 是分式方程的解,

原方程的解为x=- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

(2)方程两边同乘(x1)(x1)

x12(x1)4,解得x=-1.

经检验,当x=-1时,x210

原分式方程无解.

19.【解】∵第一步进行的是通分,

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,∴Ma

原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,当a100时,原式=1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

20.【解】设乙同学骑自行车的速度为x km/h,则甲同学骑自行车的速度为1.2x km/h

根据题意,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,解得x12.

经检验,x12是原分式方程的解,

答:乙同学骑自行车的速度为12 km/h.

21.【解】(1)A2a282(a24)2(a2)(a2).

(2)(答案不唯一)选择代数式AB

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

22.【解】去分母,得2xm2x4

整理,得6m3x

(1)由分式方程有增根,得x20,即x2

x2代入6m3x,得m0.

(2)解分式方程,得x <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

根据分式方程的解为正数,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>0,且 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>2

解得m6m≠0.

23.【解】原方程化为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>0

y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,则原方程化为y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>0

方程两边同时乘y,得y210

解得y1y=-1

经检验,y1y=-1都是方程y <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>0的解,

y1时, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>1,该方程无解,

y=-1时, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> =-1,解得x=- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

经检验,x=- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 是原分式方程的解,

原分式方程的解为x=- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

24.【解】(1)B型充电桩的单价为x万元,则A型充电桩的单价为(x0.3)万元,

由题意,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,解得x1.2

经检验,x1.2是原分式方程的解,

x0.30.9.

答:A型充电桩的单价为0.9万元,B型充电桩的单价为1.2万元.

(2)设购买A型充电桩a个,则购买B型充电桩(25a)个,

由题意,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 解得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>a <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> <a href="/tags/300/" title="素质" class="c1" target="_blank">素质</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/499/" title="评价" class="c1" target="_blank">评价</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

a为非负整数,∴a可取141516

共有三种方案,

方案一:购买A型充电桩14个,购买B型充电桩11个,购买费用为0.9×141.2×1125.8(万元)

方案二:购买A型充电桩15个,购买B型充电桩10个,购买费用为0.9×151.2×1025.5(万元)

方案三:购买A型充电桩16个,购买B型充电桩9个,购买费用为0.9×161.2×925.2(万元).

25.225.525.8,∴方案三所需购买总费用最少.