Đáp án:
Dãy số trên có số số hạng là:
`(99 - 5) : 2 + 1 = 48` (số)
Mỗi cặp 2 số thì có số cặp là:
`48 : 2 = 24` (cặp)
`⇒ 99-97+95-93+...+7-5`
`= (99 - 97) + (95 - 93) + ... + (7 - 5)`
`= 2+ 2 + ... + 2`
`= 2 . 24 `
`= 48`
Có số số hạng là
`[(99-5):2+1]:2=24`
`99-97+95-93+...+7-5`
`=(99-97)+(95-93)+...+(7-5)`
`=2+2+...+2`
`=2x24`
`=48`
pop in for a chat whenever you are in town. (HAPPEN) ⇒ if...........................................in town, pop in for a chat.
EX1. 1. He said, “ I have already read this book” => He said …………………………………………………………………………………………….. 2. Join said to his sister, “I want to buy a gift for our mother” => Join told his sister ………………………………………………………………………………… 3. Mrs Brown said, “where are they living?” => Mrs Brown asked me……………………………………………………………………………… 4. “Do you know the girl over there?” Tom said. => Tom asked me ……………………………………………………………………………………… 5. Mother said, “Nam, why don’t you go to bed?” => Mother asked ……………………………………………………………………………………… 6. “May I use your telephone?” said my neighbor. => My neighbor asked me …………………………………………………………………………… 7. The manager said, “come into my office, please.” => The manager told his secretary …………………………………………………………………… 8. “Do not get off the bus while it’s going.” Said the driver => The driver asked the passengers ………………………………………………………………….. 9. She asked to the little boy, “Take a look at yourself in the mirror!” => She told the little boy ……………………………………………………………………………… 10. “Don’t put your elbow on the table!” he said. => He ordered me …………………………………………………………………………………… EX2. 1. He said, “they went away yesterday. => He said ………………………………………………………………………………. 2. “I have lived here for ten years” said Tom. => Tom said ……………………………………………………………………………… 3. The manager said to his assistant, “I’m going to Paris next week.” => The manager said to his assistant, …………………………………………………… 4. My friend said, “ I haven’t done my homework.” => ………………………………………………………………………………………… 5. I think it won’t rain this evening.” Said mother. => ………………………………………………………………………………………… 6. Mr Clack said, “why are you so sad, Join?” => ………………………………………………………………………………………… 7. “Is it time to go?” she wondered. => ………………………………………………………………………………………… 8. They said to me, “do you sleep in the afternoon?” => ………………………………………………………………………………………… 9. “why didn’t you come here last Sunday?” asked Mary. => ………………………………………………………………………………………… 10. The traveler said, “how long does it take to get to Ha Noi by plane?” => …………………………………………………………………………………………
100×10 435×10 112×3 987×5 Cho hay nhất và 5sao
6.The (long)................................ of the experiment is 20 minutes 7.My aunt works as a(chemistry)............................at a university 8.Pupils are very interested in outside class(act)................... 9.Some people play sport to be (health)..............not because they like it 10.Sometimes we are bored and(sleep).................. with his long
Cho tam giác ABC co dien tích 250cm2.canh BC=30cm.tren canh AB lay diem M sao cho AM=2/5 AB. Trên cạnh AC lấy diểm N sao cho AN=2/5 AC. Trên cạnh BC lấy diểm I sao cho BI=2/3 BC. Nối M với N, N với I. Tính dien tich hinh tam giác AMN và dien tich hinh thang MNBI. Tính độ dàu doạn MN
Hãy chỉ ra những bước tiến trong nhận thức, những dấu mốc cơ bản trong quá trình hình thàn và phát triển TTHCM
Vẽ mầm khinh thường Ngoài lề : Ai tâm sự với toiiiii đii :)
Give the correct forms of the words given to complete the sentences 1 Students of our school are (friend)................with one another 2.When foreigners talk to him,he can speak English(easy)................with them 3.Be (care).............!The ground is very wet and slippery 4.I like the fried chicken in our school canteen :it's really (taste).................. 5.Children look very (excite)..............while playing games during break time
Giúp mik với các bạn, mik cảm ơn ạ
Xác định TN,CN,VN và cho biết mỗi câu đó thuộc loại câu nào? a. Nhà bạn Lan có một chú mèo xinh xắn, một chú chó thông minh và một đàn gà mới nở. b. Khi mặt trời vén mây nhìn xuống, sương mù tan dần và cảnh vật hiện ra rõ hơn. c. Mọi người đều làm việc còn con thì ngồi không.
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến