a) 3,45 x 123 - 3,45 x 23
= 3,45 x (123 - 23)
= 3,45 x 100 = 345
b) 21,2 + 7,63 + 8,8 + 2,37
= (21,2 + 8,8) + (7,63 + 2,37)
= 30 + 10 = 40
Đáp án:
Giải thích các bước giải:
= 3,45x(123-23)
= 3,45x 100
= 345
= (21,2+8,8)+(2,37+7,63)
= 30 + 10
= 40
* nhớ cảm ơn+ 5 sao+ câu trl hay nhất nếu thấy hữu ích nha!
Tính thế năng của một khối bê tông có khối lượng là 100kg ở độ cao 5m so với mặt đất. Chọn gốc thế năng tại mặt đất lấy g = 10m/s^2
1 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “My favorite leisure activity is people watching.” “_______” A: That’s all right. B: OK. That’s very kind of you C: That sounds so weird! D: Sure. It’s very entertaining. 2 Choose the word whose underlined part is pronounced differently from the others. A: found B: out C: sound D: enough 3 Choose the best answer a, b, c or d to complete the sentence. Question 5. How much time do you spend _______ leisure activities? A: on B: for C: with D: in 4 Choose the sentence so that it has similar meaning to the first one. Question 22. She likes to hang out with friends on Saturday evening. A: She’s fancy hanging out with friends on Saturday evening. B: She’s keen in hanging out with friends on Saturday evening. C: She’s interested in hang out with friends on Saturday evening. D: She’s interested in hanging out with friends on Saturday evening. 5 Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. Internet addicts find it hard ___________.
Thế nào là viết đoạn văn trong văn bản thuyết minh
bài 2 mn ơi hứa sẽ vote 5 sao
Viết đoạn văn diễn dịch khoảng 10-12 câu để làm rõ nội dung : Bài thơ "Nhớ rừng” của Thế Lữ đã diễn tả niềm khát khát tự do mãnh liệt bằng những vần thơ tràn đầy cảm xúc lãng mạn.
Giúp em với các mod ơi :< làm ưn đó
I. Find the word which has a different sound in the underlined part 1. A. concern B. control C. correct D. hot 2. A. silence B. absent C. content D. legend 3. A. michanic B. stomachache C. christmas D. chance 4. A. guitar B. gallery C. gangster D. general II. Choose the best answer A, B, C or D 1. What does your mother often do ………………… her free time? A. for B. at C. in D. on 2. She hates doing the gardening because she thinks it is…………………. A. tired B. tiredness C. tiring D. tiredly 3. Mum, I lost my shoes yesterday. –Don’t worry. I ………………… you the new onestomorrow. A. will buy B. buy C. buys D. buying 4. Anna’s apartment is ………………… the fifth floor. A. on B. at C. of D. by 5. Playing sports always gives you ……………..and makes you …………………. A. pleasant/ healthy B. pleasure/ health C. pleasure/ healthy D. pleased/ healthy 6. I …………… her recently. The last time we met was at a party. A. have seen B. haven’t seen C. didn’t see D. saw 7. She ………….because she’s late for her class. A. runs B. ran C. is running D. has ran 8. My passport ………… last year while I was on vacation. A. stole B. has stolen C. was steal D. was stolen 9. This cake is made ……… fresh butter and eggs. A. in B. of C. by D. from 10. You don’t need to take ………. food on the trip. A. a B. some C. any D. the 11. Breakfast ……… in this hotel until 7a.m. A. served B. didn’t serve C. isn’t served D. isn’t serving 12. Would you like ……………. milk in your coffee? A. any B. some C. a D. a few 13. Flour is the main …………. in cakes. A. recipe B. dish C. formulary D. ingredient 14. How………….. cheese do we need to make a cheese cake? ~ About 250 grams. A. few B. many C. much D. little 15. Janna can’t play the piano, and Carol can’t play it …………. A. either B. too C.neither D. as well III.Fill In each blank with a word from the box. service money back but clothing while volunteer together Many people (1) ………. in their communities. Some people work with children or the elderly (2) ……… others clean city parks. Some student clubs require their members to participate in a certain number of hours of community (3) ………. every month. One way that communities work (4) ………. is by raising funds for those in need. A community might raise (5) ………… for a school to buy new equipment or uniforms by selling baked goods or holding a yard sale. Many communities provide places for people in need to receive food, (6)………, or shelter. Volunteering can help people feel like they are giving something (7) ……. to their communities. Sometimes a person may need help at one time (8) …….. be able to help others later.
Cho tứ diện ABCD, E là trung điểm AD, F là trung điểm BC và G là trọng tâm tam giác BCD. Tìm mệnh đề sai: (Vẽ hình giải thích minh họa chi tiết) A. vtEB + vtEC + vtED = 3vtEG B. vtGA + vtGB + vtGC + vtGD = vt0 C. vtAB + vtAC + vtAD = 3vtAG D. 2vtEF = vtAB + vtDC
Giải hộ mk bài này vs.
hãy nêu xuất xứ của câu:" ... Dân tộc ta, nhân dân ta, non sông đất nước ta đã sinh ra Hồ chủ tịch, người anh hùng dân tộc vĩ đại, và chính Người đã là rạng rỡ dân tộc ta, nhân dân ta và non sông đất nước ta..."
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