当前位置:首页 > 八年级 > 数学试卷

【330706】第五章 分式与分式方程 周周测8(全章)

时间:2025-02-11 18:38:46 作者: 字数:1892字

第六周每周一练

一、选择题

1、下列各式: <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 其中分式共有( )个.

A2 B3 C4 D5

2、下列判断中,正确的是( )

A、分式的分子中一定含有字母 B、当B=0时,分式 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 无意义

C、当A=0时,分式 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的值为0AB为整式) D、分数一定是分式

3、下列各分式中,最简分式是( )

A <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> C <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

4、下列约分正确的是( )

A <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> C <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

5、下列各式中,从左到右的变形正确的是( )

A <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

C <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

6AB两地相距48千米,一艘轮船从A地顺流航行至B地,又立即从B地逆流返回A地,共用去9小时,已知水流速度为4千米/时,若设该轮船在静水中的速度为x千米/时,则可列方程( )

A <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> C <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

7、若把分式 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 中的xy都扩大3倍,那么分式的值( )

A、扩大3B、不变 C、缩小3D、缩小6

8、已知 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,则 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 值为( )

A <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> B <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> C <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> D <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

二、填空题

9.若分式 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的值为0,则a= ;当x ______时分式 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 有意义.

10、① <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .

11、如果 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> =2,则 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> = .

12、若分式 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的值为负数,则 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的取值范围是 .

13、已知 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,整式AB的值分别为 .

14、若 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> __________.

三、计算题

15 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 16 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>






17 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 18 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>






19 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 20 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>






四、先化简,后求值

21 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,其中x=5.




22 <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .



答案:

1--8.ABCCBACB

9.-2 x2x-3 10.6a2 a-2 11. <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 12.x <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 13.-1,2 14. <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

15. <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 16. <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 17. <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 18. <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 19.x=2 20.方程无解

21.原式=5.

22.原式= <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>