Cùng một lúc ở hai địa điểm A và B cách nhau 150km có hai xe cđộng ngược chiều nhau.. Xe đi từ A đi với vận tốc 70km/h, xe đi từ B có vận tốc 40km/h. .a xác định thời gian và vị trí 2 xe gặp nhau. .b xác định tđiểm 2 xe cách nhau 20km. ......... 2 tựa như bài 1 chỉ thay đổi số liệu Cách nhau 10km Chuyển động cùng chiều Vận tốc A là 40km/h Vận tốc B là 30km/h .a .b như câu GIÚP MIK VỚI MIK CẢM ƠN NHIỀU Ạ RẤT GẤP Ạ.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions People think children should play sports. Sports are fun, and playing with others. However, playing sports can have negative effects on children. It may produce feelings of poor self-respect or aggressive behavior in some children. According to research on kids and sports, 40,000,000 kids play sports in the US. Of these, 18,000,000 say they have been yelled at or called names while playing sports. This leaves many children with a bad impression of sports. They think sports are just too aggressive. Many researchers believe adults, especially parents and coaches, are the main cause of too much aggression in children's sports. They believe children copy aggressive adult behavior. This behavior is then further strengthened through both positive and negative feedback. Parents and coaches are powerful teachers because children usually look up to them. Often these adults behave aggressively themselves, sending children the message that winning is everything. At children's sporting events, parents may yell insults at other players or cheer when their child behaves aggressively. As well, children may be taught that hurting other players is acceptable or are pushed to continue playing even when they are injured. In addition, the media makes violence seem exciting. Children watch adult sports games and see violent behavior replayed over and over on television. As a society, we really need to face up to this problem and do something about it. Parents and coaches should act as better examples for children. They also need to teach children better values. They should teach children to enjoy themselves whether they win or not. It's not necessary to knock yourself out to enjoys sports. Winning isn't everything. In addition, children shouldn't be allowed to continue to play when they are injured. Sending a child with an injury into a game gives the child the message that health isn't as important as winning. If we make some basic changes, children might learn to enjoy sports again. 28. What is the main idea of the reading? a. Children often become like their parents b. Children need to play sports in school c. Playing sports may have negative results d. Some sports can cause health 29. How may children said they had some negative experience when playing sports? a. All of the children b. More than half of the children c. Less than half of the children d. About ten percent of the children 30. Which is described as the main cause of more aggressive playing? a. Adults b. Children with low grades in school c. New rules in sports d. Other players 31. What does the writer suggest? a. Aggressive sports shouldn't be shown on television b. Children shouldn't play sports until high school c. Coaches should be required to study child psychology d. Parents should teach children to play sports for fun and exercise 32. What would probably NOT be done when "facing up to a problem"? a. Ignoring the problem b. Finding the reason c. Admitting there is a problem d. Looking for a solution Mọi người giúp em bài này với ạ

Giúp mình với mình cho hay nhất lunnnnn

Dùng sơ sơ đồ horner hãy phân tích các đa thức sau thành nhân tử, giúp e bài này với ạ

"Bên cạnh Bác, luôn xuất hiện hình ảnh lửa hồng , hình ảnh ngọn lửa hồng có ý nghĩa gì ?"

Tìm lỗi sai và sửa 1. This girl is the most beautiful of the two daughters that he has. 2. Frank plays tennis worse of all the players. 3. She can pronounce English words more correct than she could last term. Giúp.mik.nha

dung 3,36 khí co đê khư fe2o3 ơ nhiet đô cao thu đươc a g fe va v lit khí co2 ơ đktc biết H = 80%.Tính a va v

Các bạn giải giùm mk vơi mình sắp phải nộp cho cô rồi

CMR các biểu thưc sau có giá trị âm với mọi giá trị x a) -$x^{2}$ +3x-3 b) -$x^{2}$ +5x-8 c) -$9x^{2}$ +12x-5

Từ điểm A ở ngoài đường tròn (O)(OA > 2R), vẽ hai tiếp tuyến AB, AC và cát tuyến ADE của (O). Gọi K là trung điểm của AC, OA cắt BC tại H. a. Chứng minh HK // AB và tứ giác CHDK nội tiếp b. Chứng minh KC2 = KD.KB và BE // AC giúp mình câu a b thôi ạ cảm nhìu :3