2012年石家庄28中初中数学二模试卷 2012年石
编辑： admin 2017-03-03
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一、填空题（每题2分,共20分）
1．计算：_______．
2．在显微镜下,一种细胞的截面可以近似地看成圆,它的半径约为0.000 000 78m,用科学记数法,我们可以把0.000 000 78m写成_______m．
3．据统计,某市今年参加初三毕业考试的学生为48000人．为了了解全市初三考生毕业考试数学考试情况,从中随机抽取了600名考生的数学成绩进行统计分析,在这个问题中,样本容量是________．
4．计算：_______．
5．计算：• _______．（n是整数）
6．若方程组 的解是 ,则 _______．
7．一个多边形的每一个外角都是60°,则这个多边形的内角和为________°．
8．若x－y＝2,xy＝3,则x2y－xy2＝________．
9．若 ＝ab－c,＝ad－bc,则 × _______．
10．如图a是长方形纸带,∠DEF＝25°,将纸带沿EF折叠成图b,再沿BF折叠成图c,则图c中的∠CFE的度数是_______°．
二、选择题（每题3分,共24分,请将答案填写在表格中）
题号\x0511\x0512\x0513\x0514\x0515\x0516\x0517\x0518
答案
11．下列各计算中,正确的是( )
A． B．
C． • D．
12．下列四种说法；①为了了解某批灯泡的使用寿命可以用普查的方式；②“在同一年出生的367名学生中,至少有两人的生日是同一天”是必然事件；③“打开电视机,正在播放少儿节目”是随机事件；④如果一个事件发生的概率只有十亿分之一,那么它是不可能事件．其中,正确的说法是( )
A．②④ B．①② C．③④ D．②③
13．某人不慎将一块三角形的玻璃摔碎成如下图所示的四块（即图中标有1、2、3．,4的四块）,你认为将其中的哪一块带去玻璃店,就能配一块与原来形状相同的三角形玻璃．应该带( )
A．第1块 B．第2块 C．第3块 D．第4块
14．如下图,AB＝DB,∠1＝∠2,添加了下面的条件但仍不能判定△ABC≌△DBE的是( )
A．BC＝BE B．∠ACB＝∠DEB C．∠A＝∠D D．AC＝DE
15．如图,DE∥BC,CF为BC的延长线,若∠ADE＝50°,∠ACF＝110°,则∠A的度数是 ( )
A．60° B．50° C．40° D．不能确定
16．如图,与左边正方形图案属于全等的图案是( )
17．某中学七年级—班40名同学为灾区捐款,共捐款2000元,捐款情况如下表：
由于疏忽,表格中捐款40元和50元的人数忘记填写了,若设捐款40元的有x名同学,捐款50元的有y名同学,根据题意,可得方程组( )
A． B．
C． D．
18．若关于x,y的二元一次方程组 的解满足不等式x0,则k的取值范围是( )
A．－7
类似问题
类似问题1：石家庄辅导初中英语哪里好?初中英语辅导哪里好?
去金泽jiaoyu吧,挺好的.师资力量雄厚,一流的教学环境.很不错
类似问题2：只有5个财富.如题.[数学科目]
延长BD,交AC于点N
∵AD⊥BN,AD平分∠BAN,AD=AD
∴△ABD≌△AND
∴AB=AN,BD=DN
∵M是BC的中点
∴DM是△BCN的中位线
∴DM=1/2CN =1/2(AC-AN)=1/2(AC-AB)=3
类似问题3：英语翻译各位英语达人行行好吧.快开学了急啊[英语科目]
How to make friends
It’s hard to make friends if you stay alone all the time.It’s easier to make friends when you have similar interests.
Don’r be afraid to show people what you are really good at.Talk about the things you like and do best.
Look at people in the eyes when you talk to them.
Be a good listner.Let people talk about themselves before talking about yourself.
Be friendly to a lot of people.Try to help your friends when they are in trouble because a friend in need is a friend indeed.That way you’ll have a bigger group to choose from and have more chances to make friends.
My view on television
Television has come into our life for many years.
We can’t live happily without television.Jt can give us the latest information and news.It can open up our eyes and enlarge our knowledge.We can get happiness from the plays on television.We’ll be boring all day if there is no television.Television programs are attractive.After a whole day’s hard worlk we can sit before the television and drink a cup of tea.How wonderful it is!
Television is also bad for people’s health.It’s bad for you to watch TV too long,especially bad for your eyes.
It is true that watching TV can influence our behavior.However,it depends on what we do.
My view on school uniform
At our school ,we have to wear uniforms every day.The problem is that all my classmates think the uniforms are ugly.We think young people should look smart and so we would like to wear our own clothes.Our teachers believe that if we did that.We would concentrate more on our clothes than our studies.We disagree.We should feel more comfortable and thate is good for studying.If we can’t do that,we should be allowed to design our own uniforms.We also think everyone should be different from others.That would be a good way to keep both teachers and students happy.
My opinions on volunteering
We are middle school students and we are busy with our lessons.So some people think we should concentrate more on our studies.If we volunteer to help others,it’s a waste of time.But I think volunteering is great.I not only feel good about helping others but also get to spend time doing what I love to do.And from volunteering I have learned many things that I have never learned in class.So if I have an oppoutunity,I’d like to visit old people’s home to clean up for them.I’d also like to help sick kids in hospital.I love kids and I plan to put my love to good use by working in hospital.In a word,I’d like to help people who need help.If everyone helps out a bit,the world will be more colorful.
Small kinds
Human beings are advanced animals in the world.Some animals are very kind.For example ,if you are kind to a dog ,it will shake.It will tail to you.So if you are kind to others,they will also be kind to you.
You have lots of chances to give your small kindness if you see a disabled person working in the street.You can help him to cross the street.If you meet a stranger,you can show him the way.If he or she asks you questions,you should be kind to answer them.That is you give small kindness to others.Maybe it seems to you a piece of cake,but it is very important to people in need.If you do this,the others will do it to you.
Be kind to others,and they will be kind to you.
My opinion on Internet
Hello,everyone!As you know,many students like to work on the Internet.Of course,it can bring us many good things.We can learn more knowledge outside our books,practice our spoken English with someone else and look up some useful information.
At the same time,it can bring us some bad things as well.Some students have made too many friends,seen some bad information that is not good for us and spent too much time on it.We should know what to do and what not to do.
That’s my idea.Thank you for listening!
Internet shopping
Internet shopping is a new way of shopping.It offers a lot of advantages.The most important one is convenience.You can shop whenever you like because the online shops are open 24 hours a day.And you don’t have to queue with others.And it is often cheaper to buy goods through the Internet and it is also easy to find what you are looking for.
There are some disadvantages,too.You can not see the products or check their qualities.Besides you can not enjoy walking around the shops and talking with your friends.
类似问题4：初中英语教学论文,会计论文,谁帮我写
你可以找专写论文的人啊
我认识一个很不错的,我和几个朋友都常常找他写,因为他的信誉非常好
Q号就是1~9~9~6~2~0~7~8
类似问题5：下周就中考了...财富不多了,求耐心长辈详解...25.(本题满分14分）如图,Rt△AOB中,∠A＝90°,以O为坐标原点建立直角坐标系,使点A在x轴正半轴上,OA＝2,AB＝8,点C为AB边的中点,抛物线的顶点是原点O,[数学科目]
具体细节就不做给你看了,提示一下吧先假设存在,设m点坐标为（a,2a）则由顶点式或其他方法可求出含a的抛物线解析式·····又因为四边形ODBC为平行四边形,已知BC=4,所以OD=4,即可知道D点坐标为（0,4）将D点坐标带入...