bàn về truyện kiều có câu 

hỡi ôi thân ấy

biết là mấy thân

lời thơ trên nhằm chỉ nhân vật nào trong truyện kiều? thân ấy là thân nào?

(x ^2−x+2) ^2−3(x+2) ^2=(x ^2−x) ^2−5x ^2 −21x

Exercise 4. Viết lại câu:
1. People say that Linda’s family has a lot of money.
=> It is said that _________________________________.
2. People say that the plane takes off at 4 pm.
=> It is said that _____________________.
3. People say that Lisa passed the test yesterday.
=> It is said that __________________________.
4. People say that the children have eaten fast food for 2 days.
=> It is said that _________________________________.
5. People say that Katy is a beautiful girl.
=> It is said that __________________.

Exercise 3:
1. It is said that the thief stole several wallets.
The thief ________________________________________
2. The Sun was believed to move round the Earth.
It was __________________________________________
3. The witness was thought to have injured.
It was __________________________________________
4. They believe that the lunch will be delicious.
The lunch is _____________________________________
5. The newspapers reported that he won the jackpot.
He was ________________________________________

Exercise 2:
1. People think that the new prime minister is a good speaker.
➔ It is ___________________________________
➔ The new prime minister __________________
2) They report that the suspended gunman is in custody.
➔ The suspended _________________________
➔ It is __________________________________
3) People don't expect that the new party will win the election.
➔ It isn't ________________________________
➔ The new ______________________________
4) The police say that the principal is at large.
➔ It is _________________________________
➔ The principal _________________________
5) The detective knows that the robber has left the city.
➔ It is _________________________________
➔ The robber ___________________________
6) People believe that giving encouragement is important at work, too.
➔ It is ___________________________________
➔ Giving encouragement ____________________
7) They told us that Charles drank too much at the party.
➔ It was _________________________________
➔ Charles ________________________________

cho 2 đườg thẳg xy và zt cắt nhau tại O . bt rằng gócxOt lớn gấp 4 lần gócxOz . Tính các góc xOt , tOy , xOz , yOz

1. Ptu mARN dài 3366Ao. Có một riboxom trượt 1qua 1 lần trên mARN maast 33 giây. Hãy cho biết tốc độ dịch mã của riboxom là bao nhiêu axit amin trong 1s?

tại sao con người lại nhỏ bé đến như vậy ?

p/s: câu hỏi mẹo

giải phương trình 25^x  + 2.5^x  - 15 = 0

giải phương trình   9^x  -3^x  - 6 = 0    

$A=\frac{2-\sqrt{x}}{x}. Tìm x để A=3$