Ta dễ nhận thấy :
11 - 6 =5
16-11=5
=> Đấy là dãy số cách đều
=>Trung bình cộng = (số đầu + số cuối) : 2
Vậy a là :
56 x 2 - 6 = 106
Ta có:
`(a + 6) : 2 = 56`
`a + 6 = 56 × 2`
`a + 6 = 112`
`a = 112 - 6`
`a = 106`
Vậy `a = 106`
Giải thích:
- Vì đây là dãy số cách đều nên trung bình cộng = (số đầu + số cuối) : 2
Một HCN có chu vi là 76m nếu giảm chiều dài đi 5m thì diện tích giảm 65m2 . Tính diện tích HCN ban đầu.
Một cuốn sách dày 480 trang . Ngày đầu Nam đọc 5/8 số trang . Ngày thứ hai Nam đọc tiếp được 60% số trang còn lại. a) Số trang mỗi ngày Nam đã đọc là bao nhiêu ? b) Tính tỉ số phần trăm của số trang sách còn lại sau hai ngày so với số trang của cuốn sách
IV. Use the words and phrases to write a passage. 1. Stamp collection/ be/ interesting hobby. 2. You/ can learn many things, such/ the geography/ a country/ stamps. 3. Postal stamps/ be a source/ interesting facts/ important dates/ every country/ the world. 4. It/ make stamp collecting/ become very popular. 5. As you look at the pages/ a stamp album, you/ can learn interesting details/ foreign customs/ arts/ literature/ history/ culture. 6. Their colors/ can make/ you feel relaxed/ happy. 7. Collecting stamps/ can become/ a business. 8. If you are lucky/ finding/ special stamp, it/ will bring/ you some money besides knowledge/ pleasure. Làm giúp e với. Lưu ý không coppy mạng = báo cáo
Reorder the words to have correct sentences 61. the/on/the/right/on/is/bookstore ..................................................................... 62. tell/you/could/to/me/how/the/to/get/post office/? ................................................................ 63. she/like/to/some/would/buy/stamps ......................................................................... 64. always/church/he/to/goes/Sundays/on ........................................................................... 65. soccer/boys/often/the/recess/play/at/do/? ....................................................................... 66. the/Lan/playing/piano/is ................................................................................................. 67. do/what/at/often/do/you/recess/? ...................................................................................... 68. enjoys/Physics/Hoa/always/learning ............................................................................. 69. bed?/go/you/what time/ do/to ........................................................................................ 70. get/I/at/six/often/up / don’t
Giúp mình 1 bài này nhé! Hứa cảm ơn+ ctlhn
Cho tia Ot, trên đó lấy điểm M sao cho OM = 6cm. Trên tia đối của tia Ot lấy điểm N sao cho ON = 2cm. Cho biết độ dài đoạn thẳng MN.
đây là trách nghiệm :< chỉ cần ghi số câu trước đáp án là đc ạ em cảm ơn I.Chọn đáp án đúng nhất để hoàn thành các câu sau: 1.If I had free time, I __________some shopping with you. A. did B. will do C. would do D. would have done 2. If you_________English well, you will communicate with foreigners. A. speak B. had spoken C. speaks D. spoke 3.Unless she__________, she will be late for school. A. hurried B. hurries C. will hurry D. is hurrying 4. Will you be angry if I__________ your pocket dictionary? A. stole B. have stolen C. were to steal D. steal 5.If the wall weren’t so high, I__________it up to take my ball down. A. climbed B. could climb C. is climbing D. climb 6. If he__________the truth, the police wouldn't arrest him. A. tells B. told C. had told D. would tell 7. If you press that button, what_________? A. would happen B. would have happened C. will happen D. happen 9. If they__________ me to their wedding party, I wouldn’t refuse. A. had invited B. invited C. invite D would have invited 10.If I were you, I_________ this job. A.accept B.will accept C.would have accepted D. would accept 11. If my mother ________ me up, I will catch the bus. A. doesn't pick B. didn’t take C. not pick D. hadn’t picked 12. If the weather is nice, I ________for a walk. A. will go B. go C. would go D. would have gone 13. If she had money, she__________that house. A. would have bought B. could buy C. will buy D. had bought 14.If I had a map, I________. A. can get lost B. won't get lost C. wouldn't have got lost D. wouldn't get lost 15.I will help you if you________my secret. A. kept B. will keep C. keep D. would keep 16.I'd give up my job if I________a big prize in a lottery. A. win B. won C. had won D. would won 32. I'll help you if__________________. A. you told me the truth B. you tell me the truth C.you will tell me the truth D. you have told me the truth II.Chia dạng đúng trong ngoặc 1.I would repair the roof myself if I (have) _________________a long ladder. 2.Unless they turn that radio off, I (go) _________________mad. 3.If you were made redundant, what you (do) _________________? 4.We’ll have a long way to walk if we (run) _________________out of petrol here. 5.If you shake that bottle of port, it (not be) _________________ fit to drink. 6.If you spoke louder, your classmates (understand) _________________ you. 7.I’ll probably get lost unless he (come) _________________with me. 8.You (not have) _________________ so many accidents if you drove more slowly. 9.If you (wear) ________________ a false beard, nobody would have recognized you. 10.If she (leave) _________________ the fish here, the cat will eat it.
Lam bai hinh nay dum em em cho 5 sao
giúp mình với ạ đang cần gấp, cảm ơn mng
Vậy là niềm vui r tới nỗi buồn . Chắc ông trời đang trêu con :D vẽ đậu mầm khóc
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