七月你好图片

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七月你好图片(共10篇)

七月你好图片(一):

英语翻译
简:
您好.很高兴收到你的来信,欢迎7月来中国,以下是中国的一些习俗.
打招呼说 “你好”或问 “哪去?” ” ” 以示关心;受到赞扬时说 “噢,哪里,哪里” 或“过奖”;收到礼物时通常除了说“谢谢”还说 “太客气了”,以表礼貌,然后把礼物收好;宴席上,为了显示热情,为某人的健康或成功干杯(drink to)时我们大声交谈、碰杯(clink glasses) .
不同的文化,不同的风俗.如果你入乡随俗的话会更开心.
希望上面所提到的会对你有帮助,祝旅行愉快.
此致
敬礼!
李华

Jane:
Hello.Is very pleased to receive your letter,please come to China in July,the following are some of China"s customs.
Hello to say "hello" or ask "what go?" "To eat it?" "Busy?" To show their care; to be commended,said,"Oh,where,where," or "flattering"; received a gift is usually in addition to say "thank you" said "too polite" to the table courtesy,and then presents a good income; feast,in order to show enthusiasm for the success of a person"s health or toast (drink to) when we talk out loud,clink (clink glasses ).
Different cultures,different customs.If you do as the Romans,then may be more happy.
Hope that mentioned above will help you,and wish a nice trip.
Sincerely
Salute!
Hua

七月你好图片(二):

请问一道英语问题~!
假如你是Mary.你的生日晚会将要在7月8号举行.请你给你的好朋友Tony写一封信,邀请他来参加你的生日晚会,并把活动安排告诉他.
请各位英语强人帮忙写下,感激不尽!

Dear Tony:
My birthday is on July 8th.I will have a birthday party that night.Many friends of mine are going to my home .I hope you can come ,too.Would you like to join us?
Yours
Mary

七月你好图片(三):

情景作文 现在就要 急··
假如你是Mary.你的生日晚会将要在7月8日举行.请给你的好朋友Tony写一封信,邀请他来参加你的生日晚会,并把活动安排告诉他.
提示词语:listen to music(听音乐)
write to(给······写······)

Dear Tony,
I a Mary.y birthday is on July 8.Would you like to come to my house?Some of my best friends will coe,too.We are going to listen to music together.I hope we can have a good tie.

七月你好图片(四):

求一篇初一水平的英语生日邀请信
题如下:
假如你是Mary.你的生日晚会将要在7月8号举行.请给你的好朋友Tony写一封信,邀请他来参加你的生日晚会,并把活动安排告诉他.
50词左右就行了!

Dear Tony,
How are you I"m Mary.
I want to tell you my birthday party will be held on July 8th.I want to invite you to attend my birthday party.I prepare many programes such as dancing ,playing games ,singing.On the party,you will meet many friends and enjoy yourself.I expect you to come.
Best wishes for you !
Yours,
Mary【七月你好图片】

七月你好图片(五):

.读我国7月水系水质类别比例比较图,回答问题。

(1)说明图中河流水质分布的一般规律及其影响因素。
(2)图中河流中水质最差的是哪一条?简要分析其原因。
(3)请你提出改善我国河流水质的合理化建议。

(1)规律:南方地区河流水质较好,北方地区河流水质较差 因素:河流径流量
(2)海河 原因:流域内经济发达,生产排污量大;人口众多,生活排污量大;环保意识淡薄;径流量较小等。
(3)加强环保宣传,预防水污染;建立污水处理厂;实施水的循环利用等。

从我国7月水系水质类别比例比较图可以看出北方地区的河流水质较差,南方地区的河流水质较好,主要原因北方地区受夏季风影响时间较短,降水较少,河流径流量少;南方地区降水多,河流径流量大。其中海河的水质最差,自然原因上流域面积少径流量少;社会经济原因表现为流域内工农业发达,生产排污量大,流域内人口稠密,生活用水量大,排污多;环保意识淡薄。今后我们要通过宣传,增强人们的环保意识,实现循环经济。

七月你好图片(六):

汽车厂8月份比7月份多生产500辆汽车,已知8月份比7月份增产9分之一..7月份生产汽车多少辆?
列出数量关系式,

你好:
数量关系:7月份产量×1/9=8月份比7月份多生产的辆数
设7月份生产X辆
1/9x=500
x=4500

七月你好图片(七):

七月初期考,我急需人教版七年级英语下册知识点的复习整理一份.朋友,朋友的亲戚,亲戚的朋友可以帮的就帮帮我啦~
资料越详细越好

Ⅰ. 教材回眸
◆ 知识要点回顾 ◆
1 . Could you … ? (你 / 你们……好吗?)句型多用来表示请求,这里的 could 比 can 语气更加委婉、客气和有礼貌,肯定回答多为:OK / All right ! / Certainly ! / Of course . 否定回答常是:Sorry , I / we can’t . (不用couldn’t ).如:
—Could you lend me your dictionary ?
—Of course .
2 . one 不仅可用作基数词表“一”之意,也能用作代词替代前面所提可数名词中的“一个”或代指“任何人”.例:
1 ) One and two is three . 一加二等于三.
2 ) I don’t have pens . Please give one to me . 我没有钢笔,请给我一支.
3 ) One must love one’s country . 任何人都必须爱国.
3 . You’re welcome . 用来回答对方的感谢时,相当于That’s OK . / that’s all right . / Not at all ..如:
—Thank you very much .
— You’re welcome .
4 . too 这个副词作“太”讲时通常修饰形容词或副词(放在其前);作“也”讲时多位于句尾(其前用逗号隔开).例:
1)Your bag is too big . 你的包太大.
2)Your bag is big , too .你的包也大.
5 . 当名词前有定冠词、指示代词和物主代词修饰时,all 习惯上放在这些限定词之前.例:all my books(我所有的书).
6 . the other 通常表示两者(部分)中的“另外那个(些)”,而不带定冠词的 other 多用来泛指“另一些”.试比较:
1 ) The twins are English . One is Lucy , the other is Lily . 这对双胞胎是英国人,一个叫露西,另一个叫莉莉.
2 ) I have many friends . Some are teachers , others are police men . 我有很多朋友,一些是教师,另一些是警察.
7 . socks , shoes , trousers , glasses(眼镜)等表示两部分构成的整体东西的名词习惯上用复数形式,如果指“一双(副)”,应用a pair of 短语修饰.例:
a pair of socks(一双短袜),a pair of glasses(一副眼镜)等.
A pair of shoes is under the bed .
8 . 当询问“某人(物)怎么啦?”时,句型常用 What’s wrong with … ? 这里的疑问词 what 不可受汉语的影响误用 how .例:
—What’s wrong with your kite ? 你的风筝怎么啦?
—It’s broken .它坏了.
9 . worry 作及物动词用时其后习惯上只接人作宾语,意为“使……担心”;worry 用作不及物动词其后能接人或物作宾语,但必须用介词 about ,意为“担心……”.例:
1 ) These apples worry me . 这些苹果使我担心.
2 ) Don’t worry about my lessons . 别担心我的功课.
10 . tea , milk , bread , water , meat , rice 等物质名词均为不可数名词,此类名词无复数形式,其前不可用不定冠词、基数词、指示代词等直接修饰,若表示它们的数量,其前必须加“计量名词 + of ”短语.例:a bottle of orange(一瓶桔汁),two cups of tea(两杯茶).
但是常可以用:two cups of tea = two teas 两杯茶
11 . It’s time … 句型后接名词或代词时要用 for(介词),后接动词必须用 to(不定式符号),这里的主语 it 不可换用另的代词,且 time 前习惯上不用冠词.例:
1 ) It’s time for class . 该上课了.
2 ) It’s time to play games . 是做游戏的时候了.
注意:It is time for sb to do 该某人干……
12 . something to eat (drink ) 意为“吃(喝)的东西”,to eat ( drink ) 为不定式作后置定语修饰不定代词 something .例:
We have something to eat now . 现在我们有东西吃.
Ⅱ. 典题赏析
◆ 交际能力与测试指要 ◆
(1)根据所设情景选择最佳答案.如:
1 . — ______ ? — It’s eight thirty .
A . How old is your sister B . What class are you in
C . What’s the time , please D . What number is your car
2 . 当你有事想问别人,应先说声:______ .
A . Excuse me B . I’m sorry C . Hello D . OK
(2)根据对话情景,补全对话.如:
Kate : Hi , Jim . ( 1 ) ?
Jim : Fine , thank you . And you ?
Kate : I’m fine , too . ( 2 ) ?
Jim : Very well , thanks
Kate : ( 3 ) ?
Jim : Class Four .
Kate : ( 4 ) ?
Jim : Room Five .
Kate : Oh , I see .
A . Which is here classroom B . How is your sister
C . How are you today D . What class is she in
解答“情景交际”题首先要清楚所设的情景是哪一类交际项目;其次要清楚在哪种情景下该说什么话,该如何表达自己的思想;还要清楚上下文情景的关系.
具体题还要具体对待.上面题型(1)中的第2小题,直接选A就行了.而第1小题就必须先辨别A、B、C、D四个选项各是什么意思,然后看答句的表达形式,才能依据交际常识判断是C.第(2)小题的一组对话设计了四个问句,这样的题则要根据上下文的内容和交际习惯,与对话一一对应.
选完后一定要默默读上两遍,细心体会一下语感,认真检查一下有无疏漏,最后确定.如果试题有图片,要善于利用图片上的信息,帮助答题,要善于从情景中悟出“天机”.
◆ 交际英语讲练 ◆
※ 问候 ( Greetings ) ?
1 . “How are you ? ”“______”?
A . How do you do ? B . How are you ? ?
C . I‘m fine , thank you . D . What do you do ?
※ 介绍 ( Introductions ) ?
2 . — Li Ping , ______ . ?
— Nice to meet you , Zhang Hong . ?
A . that’s my friend , Zhang Hong B . this is Zhang Hong?
C . she is Zhang Hong D . I introduce Zhang Hong to you
3 . “Nice to meet you . ”“_______”?
A . Is that so ? B . I‘ve got a cough . ?
C . Yes , do please . D . Nice to meet you , goo .
※ 打电话 ( Making telephone calls ) ?
4 . “Hello , 5847552 . ”“Hi ! _____”?
A . Are you Linda ? B . Who are you ? ?
C . I am David . D . Is that Linda speaking ?
5 . — This is John speaking . Who is that ? ?
— _____?
A . This is Bill . B . I am Bill . ?
C . You are Bill . D . Where is bill ?
6 . — Could I speak to headmaster ? ?
— ______ please . ?
A . Hold on for a moment B . Speak loudly?
C . He is at work D . What’s wrong ?
7 . A : Hello ! Could I speak to Miss Grey , please ? ?
B : ______?
A . I‘m Miss Grey . B . Yes , you could . ?
C . SPeaking . D . Who are you ?
答案与简析:?
1 . C.“How are you ? ”是熟人之间常用的客套招呼语,答语常用 “Fine , thank you . ”或“Very well , thank you . ”表示问候的用语还有“Good morning / afternoon / evening . Hello / Hi . ”等,答语须重复原话.?
2 . B.介绍某人,常用句型“This is . . . ”.自我介绍则用“My name is . . . ”或“I’m . . . ”.? 3 . D.“Nice to meet you . ”一般在两人初次见面被互相介绍后使用,其答语为“Nice to meet you , too . ”.“How do you do ? ”和“Glad to meet you . ”也属于介绍用语.?
4 . D.打电话时,欲问对方是谁,应说“Who is that ( speaking ) ? ”.?
5 . A.打电话时,欲说“我是……”,应说“This is . . . ”.?
6 . A.接电话时,若想请对方别挂断或稍等,应说“Hold on ( for a moment ) , please . ”.?
7 . C.接电话时,若你正是对方要找的人,可说“请讲” ( Speaking . ) ;若对方要找的人不在,可说“He / She isn‘t here right now . Can I take a message for you ? ”.?
Ⅲ. 语法透视
◆ 不可数名词用法举要 ◆
不可以用数目来计算的名词称为不可数名词.学习不可数名词时,应注意以下几点:
▲不可数名词没有复数形式.如:some meat , some bread , 不可说 some meats , some breads .
▲不可数名词不能不定冠词 a , an 及数词修饰,但可用 some , any , much (许多),a lot of (许多),a little(一点)等直接修饰.如:我们不可以说a tea , two milk , 但可以说 some tea , much meat .
▲不可数名词前通常用量词来表示具体的数.如:a glass of water , two cups of tea , five pieces of bread .需要注意的是:类似短语中的介词 of 不能省去,当数词大于“一”时,量词需要用复数形式.
▲不可数名词作主语时,谓语动词用单数形式.例如:
These is some water in the bottle . 瓶里有些水.
Is there any rice in the bag ? 袋子里有米吗?
▲若不可数名词前有复数数量词修饰时,谓语动词用复数形式.例如:
There are three bottles of orange on the table . 桌上有三瓶桔汁.
试比较:There is some orange on the table .
▲对不可数名词前的修饰语提问,疑问词用 how much .例如:
They want two cups of tea .
→How much tea do they want ?
There is some milk in the glass .
→How much milk is there is the glass ?
▲对不可数名词前量词部分的修饰语提问题,疑问词用 how many .例如:
They want two cups of tea . →How many cups of tea do they want ?
▲不可数名词表示特指时可用定冠词 the 修饰.例如:
The bread on the table is Li Lei’s . 桌上的面包是李磊的.
▲有些名词即可作可数名词,也可作不可数名词,但意思却大不相同.如:glass 作可数名词,意思是“玻璃杯”,作为不可数名词,意思是“玻璃”;room 作可数名词,意思是“房间”,作不可数名词,意思是“空间”.
I have many friends bread meat milk fish (面包)(肉)(牛奶)(鱼)
Ⅳ. 难词解码
◆ some 与 any之区别 ◆
some 和 any 都有“一些”的意思,都可作形容词、代词,可修饰或代替可数名词的复数形式或不可数名词,但两者用法不同.
一、some 一般用于肯定句中.例如:
I can see some flowers . 我能直到一些花.
There is some milk in the glass . 杯子里有一些牛奶.
二、any 一般用于否定句和疑问句中.例如:
— Can you see any bread on the table ? 你看到桌子上有面包吗?
—Yes , I can see some . 是的, 我看到一些.
—Can you see any girls in the picture ? 你能看到图画上的女孩吗?
—No , I can’t see any . 不, 我一个也看不到.
三、some 可用于表示请求、邀请、希望得到肯定答复的一般疑问句中.例如:
— Can you give me some bread ? 你能给我一些面包吗?
— Certainly . Here you are . 当然可以,给你.
Would you like some bread ? 你想要些面包吗?
同学们,请看,Polly 给我们编出了一句顺口溜:
some 用于肯定句,疑问句、否定用 any ,请求、邀请与期待,仍用 some 代 any .
◆ do you like 与 would you like ◆
Do you like … ? 意为“你喜欢……吗?”“你爱……吗?”等,是提问者问对方习惯上喜爱什么,并不指目前一时爱好.其后常跟或 doing 结构作宾语.例:
Do you like meat ? 你喜欢吃肉吗?
Do you like playing basketball ? 你喜欢打篮球吗?
其肯定回答为 Yes , I do . ; 否定回答为 No . I don’t . .
Would you like … ? 意为 “你想要……吗?”“你愿意……吗?”,指说话人委婉地向对方提出请求或建议,是指目前的情况,其后常跟名词或 to do 结构作宾语.例:
Would you like some apples ? 你卢吃一些苹果吗?
Would you like to have a cup of tea ?你想喝杯茶吗?
其肯定回答是 Yes , please . 或 Yes , I’d like / love to . ; 否定回答是 No , thanks . / thank you . 或 Yes , I’d like to , but … 等.例:
A : Would you like a bottle of orange ?
B : Yes , please . / No , thanks .
would like 还可缩写为 ’d like .例:
I’d like to have a cup of tea .
Ⅴ. 幽默趣赏
◆ Tom’s Answer ◆
Tom : Dad , black hens are more clever than white hens , aren‘t they ?
Dad : How do you know it , Tom ?
Tom : Well , black hens can lay white eggs , but white hens can’t lay black eggs .
汤姆的回答
汤姆:爸爸,黑母鸡比白母鸡聪明,不是吗 ?
爸爸:你是怎么知道的,汤姆 ?
汤姆:喏,黑母鸡能下白色的蛋,而白母鸡不能下黑色的蛋.
◆ The Red Ink ◆
Bob : Mum , I‘m making a picture of my father . Where is the red ink ?
Mum : What do you want to do with the red ink ?
Bob : I’ll colour his nose red .
红墨水
鲍勃:妈妈,我正在画一张爸爸的像,红墨水在哪里 ?
妈妈:你用红墨水干什么 ?
鲍勃:我要把他的鼻子着成红色.
◆ A dishonest cat ◆
一只不诚实的猫
1 . There lives a cat in the country . It likes telling lies , so that it glosses over its mistakes .
在乡下,有一只猫,它喜欢说谎,以便掩盖自己的过失.
2 . When it catches a rat , the rat gets away . It says , “ You are too thin . I won’t catch you until you become fat . ”
它捉老鼠时,老鼠逃跑了.它说:“你太瘦了,等你肥了我再捉你.”
3 . It climbs up a tree to catch birds , the birds flies away , and it falls off the tree . It says【七月你好图片】

七月你好图片(八):

修改病句,七月的内蒙古草原,是一个美丽的季节.·因为我的语文成绩好.所以我的数学成绩差

1、搭配不当.
改成:七月的内蒙古草原,是一个美丽的地方.
2、关联词语使用不当.
虽然我的语文成绩好,但是我的数学成绩差.

七月你好图片(九):

帮忙改改托福作文~~~~谢谢啦!
谢谢啦~~~~真心请你们帮我改改作文··7月份要考试了,作文还没什么头绪.呜呜···我全部的分就这点了,不好意思哇!
Do you agree or disagree with the following statement? It’s better to make friends with intelligent people than with people who have a good sense of humor!
Obviously, in most case the intelligent friends we have could be the good teachers of us in many ways. They can influence us greatly and enhance the ability of us. However it is not completely true to say that it is better to make friends with intelligent people than with people who have a good sense of humor.
First of all, the intelligent friends have many good characteristics and they can perfect us. But not all intelligent people are good friends. As normal individuals, some of them more or less have some bad habits. To us, we always tend to unconsciously or subconsciously copy something from our friends.
Moreover, the intelligent friends’ are equipped with more experience than us. We can learn many valuable lessons from their experience. He or she could offer the wise advice when we are in face of difficult choices. Just like when we come to an unknown city for the first time, we need a tour guide. But in some centers, we are also limited by their experience. If we never make decides by ourselves, we could hardly be a mature man.
Intelligent people are sophisticated in the life, A deficiency of intelligent people as friends is the fact that many intelligent people are lack of common senses of humor, They pursue their benefits through manipulating the legal loophole., and sap the nation’s virtue by speculation and the desire for sudden , unearned wealth . Sometime they are just too clever to be wise and it could throw them into trouble and give a way to success. In a word, it is rather superficial to simply say that making friends with intelligent people is better!

obviously ,in most cases intelligent friends we have could be the good teachers of us in many aspects.They can influence us greatly and enhance ability of us ,However,it is not completely ture to say that it is better to make friends with intelligent people than with people who have a good sense of humor .
First of all,the intelligent friends has many characters ,which can perfect us .We can learn lots of valuable lessons from their experience .He or she could offer wise advice when we are in face of diffilcult decisions.Just like when we come to an unknown city for the first time,we need a tour guide.But in some centers(cant catch what u r trying to say),we r also limited by their experience,if we never make decisions by ourselves.we could hardly be a mature person.
The intelligent is sophisicated in life.A deficiency of interlligent people as friends is the fact that many of them r lack of common sense of humor.they persue their benefits through manipulating the legal loophole ,and sap the nation"s virtue by speculation and the desire for sudden,unearned wealth.sometime they r just too clever to be wise and it could throw them into trouble and give a way to success .In a word,it is rather superficial to simply say that making friends with intelligent people is better.
你好,写的文章不错,没有大的问题.有个别的地方修改了一下,加油啦.

七月你好图片(十):

初一下数学复习题
最好在7月份之间解答

数学试卷

一、选择题:本大题共10小题,每小题3分,共30分,在每小题给出的四个选项中,只有一项是符合题目要求的.
1. 图中三角形的个数是 ( )
A.8个 B.9个 C.10个 D.11个

2. 四边形的四个内角 ( )
A.可以都是锐角 B.可以都是钝角
C.可以都是直角 D.必须有两个锐角
3. 如图1,宽为50 cm的矩形图案由10个全等的小长方
形拼成,其中一个小长方形的面积为( )
A. 400 cm2 B. 500 cm2
C. 600 cm2 D. 4000 cm2
4. 已知 , ,若 , ,那么点 ( )
A.关于原点对称 B.关于 轴对称
C.关于 轴对称 D.无对称关系
5. 已知点 , ,下列说法正确的有 ( )
A.当 时,点 在 轴上 B.当 时,点 在 轴上
C.当 时,点 在第一或第四象限 D.当 时,点 在 轴左方
6. 若 的解 , 满足 ,则 取值为( )
A. B. C. D.
7. 实数 、 、 实数轴上的位置如图所示,

化简: 的结果是( )
A. B. C. D.
8. 若三角形的两边长分别为6cm和2cm,第三边为偶数,则第三边长为( )
A.2cm B.4cm C.6cm D.8cm
9. 不等式 的解集是 ,则 应满足( )
A. B. C. D.
10. 一个多边形截去一个角后,变为16边形,则原来的多边形的边数为 ( )
A.15或17 B.16或17 C.16或18 D.15或16或17
二、填空题:本大题共10小题,每小题4分,共40分,把答案填写在题中横线上.
11. 如图是画在方格纸上的某一小岛的示意图.
⑴分别写出地点 , , , , 的坐标;
⑵(3,6),(7,9),(8,7),(3,3)所代表的地点分别是什么?

12. 在方程 中,用 的代数式表示 ,得 .
13. 比较大小: , .
14. 一个等腰三角形有两边相等,它的周长为14cm,且一边长是4cm,则它的腰(相等的两边)长是 .
15. 若点 , 在第二象限,则点 , 在第 象限.
16. 不等组 的所有整数解的和为 .
17. 已知,如图,则 .

18. 一个等腰三角形的一边为3,另一边为6,则这个三角形的周长为 .
19. 如图,直线 , , 相交于点 , , ,则 ; ; ; .

20. 若 无解,那么 的解集是 .
三、运算题:本大题共5小题,共30分,解答应写出必要的计算过程、推演步骤或文字说明.
21.(本小题6分)


22.(本小题6分) 计算.



23.(本小题6分) 已知 三个内角的度数之比为 ,求与这三个内角相邻的三个外角的度数之比.


24.(本小题6分) 求 中的 .


25.(本小题6分) 若 是关于 , 的二元一次方程,则 , .


四、应用题:本大题共5小题,共50分,解答应写出必要的计算过程、推演步骤或文字说明.
26.(本小题10分) 矩形 中,已知点 , , , , , ,求点 的坐标.


27.(本小题10分) 图中标明了小强家附近的一些地方:
⑴写出公园、游乐场和学校的坐标;
⑵某周末早晨,小强同学从家里出发,沿 , , , , , , 的路线转了一下,又回到家里,写出他路上经过的地方;
⑶连接他在⑵中经过的地点,得到的图形你觉得像什么?



28.(本小题10分) 幼儿园有玩具若干件,分给小朋友,如果每人分3件,那么还余59件;如果每人分5件,那么最后一个人还少几件,求这个幼儿园有多少玩具?有多少个小朋友?


29.(本小题10分) 某车间有20名工人,每人每天可加工甲种零件5个或乙种零件4个,在这20名工人中,派 人加工甲种零件,其余的加工乙种零件.已知每加工一个甲种零件获利16元,每加工一个乙种零件可获利24元.⑴写出此车间每天所获利润 (元)与人数 (人)之间的关系式.⑵若要使车间每天获利不低于1800元,问至少要派多少人加工乙种零件?


30.(本小题10分) 含有浓度为 , , 的甲、乙、丙三种食盐水60克、60克、47克.现配制成 的食盐水100克.问甲种最多可用多少克?最少可用多少克?



2005-2006 学年第二学期期末考试七年级数学答案

一、选择题:本大题共10小题,每小题3分,共30分,在每小题给出的四个选项中,只有一项是符合题目要求的.
1. B.
2. C.
3. A
4. C.
5. D.
6. B.
7. C.
8. C.
9. B.
10. D.
二、填空题:本大题共10小题,每小题4分,共40分,把答案填写在题中横线上.
11. ⑴ (2,9); (5,8); (5,5); (7,4); (8,1);
⑵分别代表点: , , , .
12. .
13. >,<.
14. 5cm或4cm.
15. 四.
16. .
17. 180°.
18. 15.
19. 50°;95°;35°;35°.
20. .
三、运算题:本大题共5小题,共30分,解答应写出必要的计算过程、推演步骤或文字说明.
21.(本小题6分) .
22.(本小题6分) .
23.(本小题6分) 提示:由三内角比为 得三内角度数分别为40°,60°,80°.与之相邻的三个外角度数分别为140°,120°,100°,因此它们的比为 .
24.(本小题6分) 或 .
25.(本小题6分) 若为二元一次方程,则

解得 , .
四、应用题:本大题共5小题,共50分,解答应写出必要的计算过程、推演步骤或文字说明.
26.(本小题10分) , .
27.(本小题10分) ⑴公园 ;游乐场 ;学校 .
⑵邮局→宠物店→姥姥家→消防站→汽车站→学校→糖果店.
⑶略.
28.(本小题10分) 30人,149件玩具;或31人,152件玩具.
29.(本小题10分) ⑴




所以至少要派13人加工乙种零件.
30.(本小题10分) 设甲,乙,丙分别用 克, 克, 克

解得
所以甲种最多可用49克,最少可用35克.

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