某名牌手表,它的时针长为1cm,分针为1.5cm,时针和分针的运动均可视为匀速圆周运动,则时针针尖的线速度大小为——,分

原来每件衬衫盈利40元,“如果设每件衬衫应降价x元 ”, 那么降价后每件的盈利就是（40-X）元,乘以每天能卖出去的件数（20+2X）件,就是每天的盈利目标1,200元.

不好意思,刚才看错了
设每件衬衫应降价X天,则：
（45 -X）（20+4x) = 2100
900 +180x -20x -4x^2 = 2100
-4x^2 +160x - 1200 = 0
x^2-40x + 300 = 0
(x-10)(x-40) = 0
x1 =10 x2 = 40
所以,每件衬衫降价10元或40元,均可每天盈利2100元.
由于要尽快减少库存,所以,应选择降价40元.

C

B

A.多指抽象的事物。C.指写文章不用修改。D.褒词贬用了

含有艰辛,表达心情

Everyone has their own dreams, I am the same. But my dream is not a lawyer, not a doctor, not actors, not even an industry. Perhaps my dream big people will find it ridiculous, but this has been my pursuit! My dream is to want to have a folk life! I want it to become a beautiful painting, it is not only sharp colors, but also the colors are bleak, I do not rule out the painting is part of the black, but I will treasure these bleak colors! Not yet, how about, a colorful painting, if not bleak, add color, how can it more prominent American? Life is like painting, painting the bright red color represents life beautiful happy moments. Painting a bleak color represents life difficult, unpleasant time. You may find a flat with a beautiful road is not very good yet, but I do not think it will. If a person lives flat then what is the point? Life is only a short few decades, I want it to go Finally, Each memory is a solid.
翻译：
每个人都有自己的梦想,我也一样.但是我的梦想不是律师,不是医生,不是演员,甚至不是一种行业!我的梦想也许大人们会觉得可笑,但是,这是我一直追寻的!我的梦想是想要自己有一个七彩的人生!我要它成为一幅美丽的画,它不但要有鲜明的颜色,也要有暗淡的颜色,我不排除这幅画有一部分的黑色,我反而会很珍惜这些暗淡的颜色!不是吗,试问一下,一幅色彩鲜艳的画,如果不加一点暗淡的颜色,又怎能更突出它的美呢?人生就象画一样,画中鲜艳的颜色就代表着人生美丽快乐的时光.画中暗淡的颜色就代表着人生遭遇困难,不愉快的时候.也许你会觉得拥有一条平坦美丽的路不是很好吗,但我并不觉得.一个人如果一生平坦那有什么意思呢?人生只有短短几十年,我要他走到最后时,每一个回忆都事充实的!
A friend is a person who can let you feel warm when you are
depressed. I have many friends.But XXX is my best friend.He is as old as me.He taller than me.Basketball is his favorite sport.We are in the same class.He is good at study.So his study is very good.We learn from each other and help each other.He will help me if i got in trouble.I will help he as much as I can. I hope our friendship will forever and ever.
A friend is someone who can let you feel warm when you are depressed. I have many friends. However I only have one best friend and it's XXX. He is the same age as me. He is taller than me. Basketball is his favourite sport. We are in the same class. He likes studying and is good at it, so he gets high marks. We learn from each other and help each other. He will help me if I ever get into troubles. So will I. I hope our friendship will last forever and ever
翻译：朋友是当你在沮丧消沉的时候能给你温暖的人.因此我又很多朋友.XXX是我最好的朋友.他和我一样大却比我高.他最喜欢的运动是打篮球.我们是同班同学.他的学习很棒,因此他的成绩很好.我们相互学习相互帮助.我有困难的时候他会帮我,而他又困难我也会尽力帮他.我希望我们的友谊能天长地久.
My best friend and I get along with each other quite well. But we are so different. He is funnier, more outgoing than I am and i'm more serious. He is more athletic and likes to play all kinds of sports but I am smarter on study. My friend is wilder than me and I am calmer. He is tall, thin, strong,with short hair, And sometimes he is very careless and lazy. On the other hands, I am short, fat, weak, with shorthair. He is very helpful because I am very lazy and don't want to do any sports. And I will help him with his study.
I think our friendship will last forever.
翻译：我和我最好的朋友相处的非常好,但是我们却各有不同.他比我更有趣,更外向,而我很严肃.他是运动型的,各种体育运动都很喜欢,而我更擅长于学习.
我的朋友相对狂野而我相对沉静.他又高又瘦,但是很结实,留着短发.一些时候他马虎又懒散.与他相比,我显得矮胖,而虚弱.我也是短头发.他很乐于助人,因为我很懒不想做仍和运动.我会在学习上帮助他.我希望我们的友谊能够持续到永远
Today, good sunny weather, always a hundred flowers ... ..." I head swimming glasses, I sing a little song, walked meteor big, went to Zhoushan Middle School swimming pool.
Wow thiazolyl! Today, many people can really ah! A group of three students, five pile, in the pool, pushing and shoving, no better happy!
I already have lost Hing son, traveling light. "Thump!" I caught a spring, water ducks to water generally swim a ... . Nice to feel the water! I have a moment like a free fish fry for a while yet also seemed a carefree birds. Sometimes wildly breaststroke frog forward, sometimes into freestyle, rolls toward the deep water. I kept the swinging hands, feet not live playing the water splashes like a bit graceful girl, and like one a lovely boy, beautiful great!
I jumped up, roll forward. "Wow!" The water was cold and deep water, thrilled! "Crash ." my original" Deep Somersault "began. I pushed the hands, feet Yi Deng, jumped backward, turn sideways for a more perfect performance ah! I am in the midst of cheers, air to drill into the water. At this time, the students are coming to my swim. Suddenly, the pool open swim posture: breaststroke, butterfly, dog plane, everything. Overtake each other, with each side. Laughter, playfulness sound into a .
Tired, I lay quietly on the water: If water every day as partners, so the fish do my friend, my teacher, my job is only swimming . it was nice to ah!
When the sun sets, my classmates and I still play pool slapstick. Finally, the shore, and the evening's setting sun dragging our very, very long shadow. Happy swimming, I like!
翻译：“今天天气好晴朗,处处百花香……”我头顶游泳眼镜,口哼小曲,迈着流星大步,向舟山中学游泳池走去.
哇噻!今天人可真多啊!学生们三个一群,五个一堆,在泳池里推推搡搡,好不快活!
我早已耐不住兴子,轻装上阵.“扑通!”我纵身一跃,如水鸭子一般去水里畅游了…….水里的感觉真好!我一会儿像一条自由自在的小鱼,一会儿又似一只无忧无虑的水鸟.时而青蛙似地蛙泳前进,时而自由泳进,向着深水区进发.我的双手不停着摆动着,两脚不住地打着水,溅起的水花如一位位婀娜多姿的少女,又像一个个活泼可爱的男孩,美丽极了!
我跳跃着,翻滚着.“哇!”深水区的水好凉、好爽!“哗啦.”我的独创“深水空翻”开始了.我双手一推,两脚一蹬,向后一跃,侧身一转,多完美的表演啊!我在一片喝彩声中,神气地钻入水里.这时,同学们都向我游了过来.顿时,泳池里游姿开放：蛙泳、蝶泳、狗刨、应有尽有.你追我赶,互不相让.欢笑声、嬉闹声响成一片.
累了,我静静地躺在水面上：要是天天与水为伴,让鱼儿做我的朋友,当我的老师,我的作业只有游泳.那该多好啊!
夕阳西下时,我和同学们还在泳池里嬉戏打闹.终于,上岸了,黄昏的残阳把我们的影子拖得很长很长.快乐的游泳,我喜欢!
I love my family,because I have a happy family.
My father is an English teacher.His name is Jacky.He is thirty-eight.He likes playing basketball.What’s my mother jop?Is she a teacher?Yes,you’re right!My mother is very kind and nice,she is thirty-seven.My mother is always laborious work.I love my parents!
On Staurday and Sunday,I often go to the library and play the piano,My father go to play basketball.Sometimes,we watch TV and listen to music at home.
I love my family.Because I’m very happy to live with my parents together!

翻译:
我的家庭
我爱我的家庭,因为我有一个快乐的家庭.
我的爸爸是一名英语教师,他的名字叫Jacky.他今年38岁.他非常喜欢打篮球.我的妈妈是赶什么呢?她是一名教师吗?是的.你说对了!我的妈妈是一个很亲切、友善的人,她今年37岁.我妈妈总是勤劳的干活.我爱我的父母.
在星期六和星期天里,我经常去图书馆和弹钢琴.我爸爸去打篮球.有时侯,我们都在家看电视和听音乐.
我爱我家.因为我和爸爸妈妈一起生活得很开心!

I what busied one day, the body that dragging exhaustion sits silently on the balcony to syare blankly, come stealthily towards evening, late wind slowly had blown, left the cool trace of filar silk. But the balcony that also cannot bake sun broil hair is very hotly is wrapped cool. Dark, bird is less and less also, the damage that a string of bird left in the sky cries. The sun that worked one day also took off coverall, it is no longer in that way dazzling. The tender broadness that the sun that changes new clothes also changes is elegant, lovely. Tell the truth the sun can be met really choose color. The clothes that you see her wear is much more beautiful, red is blaze that one the most beautiful one color in the layer. Withered and yellow is squashy orange just was picked on the tree that orange is yellow. Foil in so beautiful color the cheek that issued arch to give a piece of peaceful. She seems to be being monitored by others same, stealthily move is moving pace, appear that kind is lightsome. Knowing at this moment is who is make a practical joke, in her that is high and scatter on luxuriant clothes went up prepared Chinese ink makes her dress becomes bit more full of stains or spots, ased if to throw one Jiao in wallow. Right now she is like a girl bashful and same, blush so that resemble squashy persimmon. Perhaps she feels embarrassed to used white gauze cloak to live then half face. Passed for ages, perhaps be she feels to be done so also of no help cowardly cowardly ground comes out to appear that kind is bashful. Then she thinks 36 plan -- go for the best thing to do, be smooth! Apparent its speed appears than a moment ago much faster, she is floating die of small blush Pang is in then later hilltop. The sky appears deserted. Again scan widely hopes horizon appeared again her form, hey! How be like two different people with foregoing the setting sun, move close to again look, it is the moon that Yin Guangshan shows so. Dark, appear soundless in that way all around.
翻译：
忙碌了一天的我,拖着疲劳的身体静静的坐在阳台上发呆,傍晚悄悄来临,晚风缓缓的吹过,留下了丝丝的凉意.但也不能将太阳炙烤得发烫的阳台裹凉.天黑了,鸟儿也愈来愈少,天空中留下了一串鸟的残鸣.
工作了一天的太阳也脱下了工作服,不再是那样刺眼.换上新装的太阳也变的温柔阔雅,楚楚动人.说实话太阳可真会挑颜色.你看她穿的衣服多漂亮,红的是火焰那一层一层中最美的颜色.枯黄的是树上刚摘下来熟透的桔子那桔黄.在这样美丽的颜色衬托下拱出了一张恬静的脸蛋.她好像被别人监视着一样,悄悄的挪移着步伐,显得那般轻盈.
这时不知道是谁在搞恶作剧,在她那高贵而又华丽的衣裳上撒上了墨汁使她的衣服变得斑斑点点,仿佛在泥坑里摔了一跤.此时她好像一个小姑娘害羞一样,脸红得象熟透的柿子.也许她觉得难堪于是便用白纱遮掩住了一半脸.过了好久,也许是她觉得这样做也无济于事便怯怯地出来显得那般羞涩.于是她便想三十六计——走为上策,溜!显然它的速度显得比刚才快多了,之后她那泛着微红脸庞消逝在山头.天空则显得空荡荡的.再放眼一望天际又出现了她的身影,哎!怎么跟先前的夕阳判若两人,再凑近一看,原来是银光闪闪的月亮.
天黑了,四周则显得那样静悄悄.
I have a goodfriend,He is a boy,he has a very nice name—Robert.He comes from England.He has big eyes,they are round and cute.He comes to China with his parents.We know each other since last year.From then on,we become goodfriends.
At weekends,we often get together to play basketball,he plays it very well,and,he sings well,too.He teaches me English and I teach him Chinese.
We are goodfriends forever.
翻译：我有一个好朋友,他是一个男孩,他有一个非常好听的名字—罗伯特.他来自英格兰,他有一对大眼睛,它们很圆很可爱.他和他的父母一起来中国.我们从去年开始认识.从那时候起,我们成为好朋友了.
在周末,我们经常一起打篮球,他打得非常好,而且,他歌唱得很好听.他教我英语然后我教他中文.
我们永远都是好朋友.
My Home Town My home town is a beautiful place. It stands beside a wide river and is rich in fish and rice. But in the old days it was a poor and backward little town. Many people had no work. They lived a hard life. In 1949 my hometown was liberated. Since then great changes have taken place there. The streets have been widened. Factories, schools, hospitals, cinemas and theatres have sprung up one after another. The life of the people is greatly improved. I love my hometown. All the more I love its people. They are working hard so as to make it still richer and more beautiful.====我的家乡 我的家乡是个美丽的地方,它座落在一条宽宽的小河旁边,富产鱼和大米. 但是在过去它是个又穷又偏僻的小镇.很多人没有工作,生活很难过. 1949年解放以来,我的家乡发生了很大的变化.道路拓宽了,工厂、学校、医院、电影院和歌剧院一个接一个建成.人们生活质量大大地提高了. 我爱我的家乡,更爱家乡的人们.他们辛勤工作保持着它的富有、美丽.
OK, let me tell you something about my weekend. I am going to do many things and be very busy on the weekend. So I do my homework on Saturday morning. In the afternoon, I am going to do housework with my mother. Because I am a good girl, I am helpful at home. On Sunday morning, I am going to visit my grandparents with my parents. In the afternoon, we are going to the park together. Because there is a kite show. And my grandparents likes making kites. I think, we can see many beautiful kites there. And we are going to buy some beautiful kites, too. Then, we are going to fly the new kites, that’s fun. In the evening, we are going to have a big dinner. We are going to have fish for dinner. Because my grandparents likes eating fish. And my grandma cooks fish well. After dinner, we are going to watch TV together. We are going to be very happy. This is my happy weekend. I like my weekend very much. What about your weekend? Can you tell me?好吧,让我来告诉你有关我周末的一些事情.我在周末将会有很多事情要做并且会很忙.所以我要在周六早上写作业.下午,我要和妈妈一起做家务.因为我是一个好女孩,在家里很有用.周日早上,我要和父母一起去看望祖父母.下午,我们要一起去公园.因为那有个风筝秀.并且我的祖父母喜欢做风筝.我认为,我们会在那看到很多漂亮的风筝.我们的也要买一些漂亮的风筝.然后我们要一起去放新的风筝,那很有趣.晚上,我们会有一个盛大的晚餐.我们会在晚餐上吃鱼.因为我的祖父母喜欢吃鱼.并且我的外婆很会做鱼.晚饭后,我们要一起看电视.我们会非常高兴.这就是我快乐的周末.我非常喜欢我的周末.你的周末是怎样的?你能告诉我吗?
Beijing Olympic Games is the 29th Olympic Games.It will last16 days, since August 8, 2008, carry on 28 matches of 302 little projects, sell 7 million tickets. In order to further improve the traffic environment, the expressway of Beijing will increase from present 500 kilometers to 718 kilometers,Beijing will let the going out swift, on time, security of people participating in Olympic Games.Hope Beijing Olympic Games can be succeeded in holding! 北京奥运会是第29届奥运会.自2008年8月8日起,历时16天,共进行28个大项,302个小项目的比赛,可售门票700万张.为进一步改善交通环境,北京的高速公路将由目前的500公里增加到718公里,北京将让参加奥运会的人们的出行快捷、准时、安全.希望北京奥运会能够成功举办!

不是我说你,自己的事自己做,小升初很容易的

设标价为x 进价为y
方程为
x=y+45
0.85x*8-8y=（x-35）*12-12y
解得
y=155 x=200
即进价为155元 标价为200元

运行状态下的转差率一般是1%~5%

设每件衬衫降价x元
2100＝(45-x)(20+4x)
解得,x=10或x=30
所以,每件衬衫应降价10元或30元

That Coca-Cola Company is set up in 1892 , general headquarter is set up in USA Qiao Ya Zhou Atlanta at present, is maximal the whole world drink company , the binomial (Coca-Cola row owning the whole...

Is there any requirement? For example, the words etc

每件衣服售价降x元与日营业额y（元）
y=（80-x）（200+6x）=16000-200x+480x-6x^2=-6x^2+280x+16000
因此y是x的二次函数
已演算,

They feel that they will be inferior to others when they don't wear the clothes which are not of famous brands

（1）
设：每件衬衫应降价X元.
（44-X）（20+5X）=1600
880-20X+220X-5X2-1600=0
5X2-200X+720=0
X2-40X+144=0
（X-4）（X-36）=0
X⒈=4 X⒉=36
答：.
（2）
设：商场平均每天能获得最大盈利是W元.每件衬衫应降价X元.
（44-X）（20+5X）=W
然后你自己算出来一个二次函数~用顶点公式求出X和W就行了.

思路：
每降价1元,则每件盈利(40－1)元,每天可售出(20＋2)件．故若设每件衬衫应降价x元,则每件盈利(40－x)元,每天售出(20＋2x)件,再根据总盈利=每件的盈利×售出的件数．可列出方程求解．
设每件应降价x元,则每件盈利(40－x)元,每天可售出(20＋2x)件,根据题意可列方程
(40－x)(20＋2x)=1200
整理得x2－30x＋200=0
解得x1=10,x2=20
因为要尽量减少库存,在获利相同的情况下,降价越多,销售越快,故每件应降价20元．
答：每件衬衫应降价20元．

原 利 润：170*50%*10=850
八折后利润：（170+170*50%）*0.8-170=34
日 销 量：850/34=25台

一个是最大电阻欧姆,一个是可通过电流 A

What they eat ,wear and use are all of famous brands.

修改病句,只要将“名牌”或“商标”任意删除一个词就好.

设每件衬衫应降价x元
（20+2x）(40-x)=1200
解得：x=10或20
答：应降价10元或20元

设每件降价x元
降价后,
每件盈利：（40-x)元
每天销量：(20+2x)件
(20+2x)(40-x)=1200
(10+x)(40-x)=600
x²-30x+200=0
(x-10)(x-20)=0
x=10或x=20
x越大,销量越大
根据题意,要尽量减少库存
所以取x=20
答：每件应降价20元

（1）列出方程4000*100*（1+X）^2=576000
解得符合方程的实根为X=0.2
故平均增长率为20%
（2）设三月份时,该电脑价格下降了X个100元,则该电脑每台价格为（4000-100X）元,月销售量为（100+10X）台,依题意得
（4000-100X）（100+10X）＝576000
解得,X＝22或X＝8
因为当X＝22时,电脑价格为4000-100×22＝1800元

1.青年去一家公司应聘,社长让他帮母亲洗脚,他在给母亲洗脚时,感受到母亲的辛劳,决心不让母亲再受苦.他的感恩和孝心得到社长认同,被录用了.2.“悠悠寸草心”是青年报答母亲的心,尽管母爱很深重,也要尽最大努力回报母亲.3、你可以根据短文把他们连在一块.4实现对社长的诺言.5、青年发现母亲的脚像木棍一样僵硬.他想起在读书是心安理得的花的钱都是母亲的血汗钱,而自己从没为母亲做过什么,因此很内疚,所以潸然泪下.6、青年为母亲洗脚从而感受到深深的母爱,决定不再让她受苦,他对母亲的感恩和孝心得到社长认同,所以被录用了. 我们老师讲过的

1 儿子与母亲之间浓浓的爱意
2 （1）青年右手、、、、、、、、潸然泪下
（2）直至今日、、、、、、、、还没有回来

1、插斜部分指的哪里?没有看明白
2、起初不同意,是因为妈妈还觉得自己年轻“脚,我还洗得动,我自己来洗吧.”后来让青年洗是因为“青年将自己必须替母亲洗脚的原委一说”,也就是为了帮孩子完成一种任务.
3、青年发现母亲的那双脚已经像木棒一样僵硬.说明了“母亲为了我受了很多的苦”,体现母爱的伟大.
4、明白了一个在学校里学不到的东西.也就是说“在读书时,青年心安理得地花着母亲如期送来的学费和零花钱”觉得这是父母应该对孩子这样做的,通过洗脚,使他明白了“那些钱是母亲的血汗钱”,体会到了母亲对他的那种爱.
5、“母亲出门在外,脚一定很脏,他决定替母亲洗脚.”
6、要懂得给予和付出,懂得报恩.
7、悠悠寸草心意思是长久的像小草般的孝心,怎样也无法报答母亲那春晖般的恩惠,母爱,是如此的伟大,我们是无论怎么也报答不完的.
唐）孟郊：游子吟
慈母手中线,游子身上衣.
临行密密缝,意恐迟迟归.
谁言寸草心,报得三春辉?
悠悠寸草心是衍生而来的.
悠悠寸草心(王蒙)
春阳五月倍温馨,唤醒悠悠寸草心.
似海恩情犹未报,愧余游戏到如今!
王蒙现代著名作家. 1934 年生于北京,原籍龙堂村人.

1.游子吟
2.那个年轻人本以为社长会问一些关于知识方面的问题,且自己为准备这方面已经花费了许多精力,对于应试则是不成问题,但他却问出了一个自己想都没想到过的问题,简直与自己去求职没有关系,所以作者很惊讶,并且觉得出乎意外.
3.母亲说,“脚,还是她自己来,她洗得动!”
4.青年是一个孝顺、懂得回报父母、努力、坚持不懈、刻苦的一个人.
5.一个人的工作能力强并不能说明他是一个人才,因为他身上所具有的性格和特点,都会给工作起一定的作用.孝敬父母,说明了你明白了他们为自己的付出,牺牲了许多,劳累了很多,只是为了自己的成才,也侧面衬托出自己有一颗感恩的心,并且懂得感受别人为自己付出的爱,孝敬父母同时也是一种有责任感的表现.你若不孝敬父母,则说明你是一个自私自利的人,完全不懂得感恩,没有责任感,完全以自我为中心,对别人为自己的付出已经感到麻木,所做的事情都是为了自己,这样的一个对工作怎么可能会认真,并且辛勤的付出.
6.他明白了母亲对他的深深的爱,以及希望他能够出人头地,感受到母亲为他的付出,让他明白要有一颗感恩的心,用自己的行动去回报母亲.

1.现在作者才知道母亲为了我受了很大的苦,社长使作者明白了在学校里没有学过的道理 2.写了一位青年向一家公司的社长求职社长让作者为父母擦身 3.悠悠寸草心意思是长久的像小草般的孝心,怎样也无法报答母亲那春晖般的恩惠,母爱,是如此的伟大,我们是无论怎么也报答不完的.

额定电压应为220V
P=U^2/R
R=U^2/P=220*220/1500=32.27欧姆
Q=Cm(T1-T2)
=4.2·10^3J/(Kg·℃)·1Kg/L·20L·(60℃-20℃)
=3.36·10^6J
Q=Pt·80%
t=Q/(P·80%)
=3.36·10^6J/(1500·80%)
=2800秒=7/9小时

1.设每件降价x元,则多售出2x件,得方程：（40-x）(20+2x)=1200.解得x=20,10.因此,每件降价10元或20元时,每天能盈利1200元.
2.数据有误.关于x的方程X平方－(m-1)X+9m+4)=0的两根,你再看看.

电压是额定电压
功率是在额定电压电流下的功率
另一个是每消耗3.6乘以10的六次方焦耳也就是一度电的电能转几圈

Brand Strategy is of great realistic significance.Brand Strategy implementation of strategic enterprises should correctly understand and handle it and the significance of the relationship between corporate culture.As market competition intensifies,the challenges facing enterprises have not only come from the prices of products and technologies,sales channels and strategies corporate governance and culture,how to create a successful brand,the brand is international enterprises to enter world markets an important means of participating in international competition.

兄弟情,数轮回!一生情,两无怨!

1、攀比行为,不正确的消费观
2、是消费者保护自身权益的手段,消费的凭证

800

设降价率为X,则 1000（1-X）（1-2X）=375 x=0.25 所以第一次降价25%.第二次为50%

A

D

答案是B、D
49 企业发展到一定阶段,利润降低,就需要升级或转移.

设降价X元.
（50-X）*(X/10*15+30)=1800
求出X的值即可

D

C

C

1)
微电子控制电热水瓶的名牌如下表,由此可见,此电热水瓶额定电压时（ 220 ）v.在额定电压下煮水6min,消耗电能是（ 0.7kW*0.1h=0.07 ）kwh.
2)
串联电阻的（ 总电阻 ）的阻值比任何一分电阻的阻值都（ 大 )
3)
用户接装的用电器的总功率最大不能超过（ 220*5=1100 ）w.在电路中,如果电流不流经用电器,而是电源两极直接相连,我们就说电源（ 短 ）路了.
4)
电能表是测量（ 消耗的电能即电流做功多少 ）的仪表.某电能表月初显示0560.6,一个月后显示0630.8,这说明该用户1个月用电（ 70.2 ）千瓦·时

解题思路：（1）每降价1元，每件盈利就比40元减少1元，而售出数量就比20多2件，再根据每件盈利×每天售出的数量=每天的盈利，即可得各空的解．
（2）每降价2元，每件盈利就比40元减少2元，而售出数量就比20多2×2件，再根据每件盈利×每天售出的数量=每天的盈利，即可得各空的解．
（3）（4）根据以上规律即可得各空的解．

（1）每降价1元，每件盈利40-1=39元，商场平均每天可售出件20+2=22件，共盈利39×22=858元；
（2）每降价2元，每件盈利40-2=38元，商场平均每天可售出20+4=24件，共盈利38×24=912元；
（3）每降价x元，每件盈利40-x元，商场平均每天可售出20-2x件，共盈利（40-x）（20-2x）元
（4）设商场每件衬衫降价x元，每天要盈利1200元，列出方程是（40-x）（20-2x）=1200．

点评：
本题考点： 一元一次方程的应用．

考点点评： 本题考查了一元一次方程的应用，解题关键是要读懂题目的意思，根据题目给出的条件，找出合适的等量关系，列出相应代数式或方程．

因为你没有发题目,无从下手呀!