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八年级补课1

八年级补课1
八年级补课1

9. ;

3、下列各式正确的是( )

A 、11++=++b a x b x a

B 、22

x

y x y = C 、()0,≠=a ma na m n D 、a m a n m n --= 5、某项工程甲乙合作n 天完成,甲单独做需要m 天完成(m n >)那么乙单独完成的时间是( )

A )(m n -天

B m n 111

-天 C m n -1天 D m

n 111-天 6、

2.

7.某化肥厂原计划每天生产化肥x 吨,由于采取了新技术,每天多生产化肥3吨,实际生产180吨与原计划生产120吨的时间相等,那么适合x 的方程是( )

(A )1201803x x =+ (B )1201803x x =- (C )1201803x x =+ (D )1201803

x x =- 5.甲、乙制作某种零配件,甲每天比乙多做5个,甲制作75个零件所用的天数与乙制作50个零件的天数相等,则甲、乙每天制作的零件数分别为________________.

五、(每题10分,共20分)列分式方程解应用题:甲、乙两组学生去距学校4.5千米的敬老院打扫卫生,甲组学生步行出发半小时后,乙组学生骑自行车开始出发,结果两组学生同时到达敬老院,如果步行的速度是骑自行车的速度的

3

1,求步行和骑自行车的速度各是多少?

2、某工作由甲乙两人合做计划6天完成,他们共做了4天后,乙被调走,因而甲又用了6天才全部完成,问甲、乙独做各需几天完成?

一艘轮船逆流航行2km 的时间比顺流航行2 km 的时间多用了40分钟,已知水速为2 km/h,求船在静水中的速度?

8.轮船顺水航行46千米和逆水航行34千米所用的时间恰好相等,水的流速是每小时3千米,则轮船在静水中的速度是_________千米/时.

18.某工程队承接了3000米的修路任务,在修好600米后,引进了新设备,工作效率是原来 的2倍,一共用30天完成了任务,求引进新设备前平均每天修路多少米?

例6、某一工程,在工程招标时,接到甲、乙两个工程队的投标书.施工一天,需付甲工程队工程款1.2万元,乙工程队工程款0.5万元.工程领导小组根据甲、乙两队的投标书测算,有如下方案:

(1)甲队单独完成这项工程刚好如期完成;

(2)乙队单独完成这项工程要比规定日期多用6天;

(3)若甲、乙两队合做3天,余下的工程由乙队单独做也正好如期完成.

试问:在不耽误工期的前提下,你觉得哪一种施工方案最节省工程款?请说明理由. (08年枣庄市)

解:设规定日期为x 天.

则甲单独完成需要x 天,乙单独完成需要(x+6)天, 所以,甲的工作效率是

x 1,乙的工作效率是61+x , 由题意,得: (x 1+61+x )×3+6

1+x ×(x-3)=1, 整理,得:x 3+6

+x x =1, 解方程,得 x =6.

经检验,x=6是原方程的根.

所以,甲单独完成需要6天,乙单独完成需要12天,

因为,不能耽误工期,所以,方案(2)显然不符合要求;

方案(1):1.2×6=7.2(万元);

方案(3):1.2×3+0.5×6=6.6(万元).

因为7.2>6.6,所以,在不耽误工期的前提下,选第三种施工方案最节省工程款.

答:在不耽误工期的前提下,选第三种施工方案最节省工程款.

一艘轮船逆流航行2km的时间比顺流航行2 km的时间多用了40分钟,已知水速为2 km/h,求船在静水中的速度?

卓越补习八年级下册英语广州牛津版课文笔记U1讲课讲稿

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Unit 1 Success stories (II) 一周强化 一、一周知识概述 1.重难点单词及短语:determined, wise, hard-working, including, miss, retire, hero, disabled, belief, national, pride, manage, intelligent, equal, refuse, for love, forget about sb, come on, save up, fight for, be equal to, in total。 2.句型 ①—Can I help you with anything? 我能帮你什么吗? —Thanks very much, but I can manage. 非常感谢,但我自己能行。 ②—Let me give you a hand. 让我帮你吧! —That would be good. 那太好了。 ③—Come on. Let me give you a hand. —If you want, I could do some typing. —得了吧,让我帮你吧! —如果你愿意,我可以打打字。 3.语言功能:学会表达提出、接受和拒绝帮助。 二、重难点知识讲解 1.What does success mean to you? [译文]对你而言,成功意味着什么? mean to sb.表示“对某人来说……意味着……”,mean为动词。

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小学五.六年级数学尖子生补习班整理习题

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