《天天伴我学数学》一道作业题．如图1：请你想办法求出五角星中∠A+∠B+∠C+∠D+∠E的值．由于刚涉及到几何证明，很多学生不知道如何求出其结果．下面是习题讲解时，老师和学生对话的情景：老师向学生抛出问题：①观察图象，各个角的度数能分别求出他们的度数吗，能的话怎么求，不能的话怎么办？学生通过观察回答：很明显每个角都不规则，求不出各个角的度数．有个学生小声的说了句：要是能把这五个角放到一块就好了？老师回答：有想法，就去试试看．很快就有学生发现利用三角形外角性质将∠C和∠E；∠B和∠D分别用外角∠1和∠2表示．于是得到∠A+∠B+∠C+∠D+∠E=∠A+∠1+∠2=180°．根据以上信息，亲爱的同学们，你能求出图2中∠A+∠B+∠C+∠D+∠E+∠F+∠G的值吗？请给予证明．
根据三角形外角的性质可得，∠BQF=∠A+∠D+∠G，再根据五边形内角和解答即可．
证明：如图，设AF与BG相交于点Q，则∠BQF=∠A+∠D+∠G，
于是∠A+∠B+∠C+∠D+∠E+∠F+∠G，
=∠B+∠C+∠E+∠F+∠AQG
=∠B+∠C+∠E+∠F+∠BQF求作业答案：句子翻译。 1. 这_百度知道
求作业答案：句子翻译。 1. 这
句子翻译。
1. 这封电子邮件应该用英语写吗？ ____________________________________ 2. 他习珐锭斥赶俪非筹石船将惯在晚上而不是白天学习？
____________________________________ 3. 他的父母太穷了？付不起他的教育费？ ____________________________________ 4. 她的新书好像已经出版了？
____________________________________ 5. 瞧不起这份工作是不对的？
____________________________________
来自学大教育
1. Should this e-mail be written in English? 2. He is used to studying in the daytime / during the day instead of in the evening. 3. His parents are too poor to pay for his education. Or: His parents are so poor that they can’t pay for his education. 4. It seems that her new book has come out. Or: Her new book seems to have come out. 5. It’s wrong / not right to look down on / upon the work / job. (答案不唯一)
赵莹莹&&教师
孟元&&教师
杨斌&&教师
王晓晶&&教师
丁文雅&&教师&&&提供更好的回答
提供更好的回答
英语作业，求翻译和答案！
问题补充&& 17:45
Reading ComprehensionPassage 1 Few people can resist a bargain(便宜贷). But bargains are not always what they seem. Some sales and bargains are good deals, but not all are. Here are some pointers to help you tell the difference between real bargains and bad deals.Sometimes a product is on sale for “below manufacturer’s cost”. Watch out for this kind of “bargain”. Why would anyone want to sell a product for less than it cost to make it? Before buying, you should find out why it is being sold at a loss to the manufacturer. Is it damaged? Is it out of style? Does it come with any guarantee? Another pointer is to read price tags on sale items carefully. For example, a price tag in a store may say “regular price $ 16”. The regular price is the price of the item before the sales started and after the sale ends. The regular price is only for that store, however. In another store, the price could be lower. A price tag may also say “ original price $ 16”. That means at one time the item sold for $16 —even as much as five years earlier! For example, the original price of pocket calculators was high when they were introduced. Now the price is much lower. Showing the original price would be misleading. Finally, be careful how you use cents-off coupons. A coupon can save you money only if you intend to use the item. The price of an item may vary at different stores, so use the coupon at the store with the lowest price. Don’t forget to add any sales tax to the item before you figure out the “cents-off” price. (297)1.&&The purpose of the author to write this article is ____________.A.&to warn the reader that some sales are not bargainsB.&to show that there are no real bargainsC.&to sell a certain product D. to warn the reader not to spend money on bargains2.&Which of these statements is an opinion?A. A tax adds to the price of an item.B.&Few people can resist a bargain.C.&The regular price is the price before or after a sale.D.&The price of pocket calculators has dropped.3. The author’s opinion of an item that sells below manufacturer’s cost is that _____.A.&it is out of styleB.&it is always a good dealC.&there may be something wrong with the itemD.&it has no guarantee4.&The author suggests that cents-off coupons should be used __________________.A.&only for items with no taxB.&for as many items as possibleC.&in stores with the lowest pricesD.&only at the largest store5.&The original price would be misleading in that ___________________________.A.&there might be a sharp change in style of the itemB.&there might be a sharp drop in quality of the itemC.&there might be a sharp drop in price of the itemD. there might be no use of the item now&Passage 2Acting is such an over-crowded profession that the only advice that should be given to a young person thinking of going on the stage is “Don’t!”. But it is useless to try to discourage someone who feels that he must act, although the chances of his becoming famous are slim. The normal way to begin is to go to a drama school. Usually only students who show promise and talent are accepted, and the course lasts two years. Then the young actor or actress takes up work with a theatrical company（剧团）, usually as an assistant stage manager. This means doing everything that there is to do in the theatre and occasionally acting in very small parts. It is very hard work indeed, the hours are long and the salary is tiny. Of course, some people have remarkable chances which lead to fame and success without this long and hard training. Connie Pratt, for example, was just an ordinary girl working in a bicycle factory. A film producer happened to catch sight of her one morning waiting at a bus stop, as he drove past in his car. He stopped and got out to speak to the girl. He asked if she would like to go to the film studio to do a test, and she thought he was joking. Then she got angry and said she would call the police. It took the producer twenty minutes to convince Connie that he was serious. The test was successful. And within A few weeks she was playing the leading part opposite one of the most famous actors of the day. But chances like this happen once in a blue moon!& (283)6. From the very beginning, the author puts it clearly that acting is a profession __________.&& A. sought after by too many&& B. too difficult for young people&& C. for slim people only && D. one can go into without special training7. For someone who feels he must act, it is very likely that ________.&& A. he will become a film star at long last&& B. he will end up without any success&& C. he will be well paid&& D. he will become a stage manager8. The film producer found Connie Pratt one morning when she was ________.&& A. at work in a bicycle factory&& B. driving past him in her car&& C. going to a film studio&& D. waiting for a bus9. A few weeks after the test, Connie Pratt found herself _________.&& A. the most famous actress of the world&& B. no less famous than the leading actor of the day&& C. as famous as the greatest actor of the world&& D. playing the leading female role in a play10. The concluding sentence “chances like this happen once in a blue moon” means _________.&& A. this is something which happens once in a while && B. this is a highly profitable chance&& C. this is something highly possible&& D. this is a very rare chance
解决时间: 09:15
回答已过期
回答有错误
完善答案说明
•确保您的回答是一个完整的回答
•相对于原答案，您的回答要更有“特色”
•请不要对原答案进行评论、反驳或者赞同找作业答案
北京千橡网景科技发展有限公司：
文网文[号··京公网安备号·甲测资字·文化部监督电子邮箱：wlwh@·
文明办网文明上网举报电话： 举报邮箱：admin1@&&&&&&&&&&&&&&&&