"Dream high" is a Korea drama series broadcast in 2011.It is a school film. It is about six students at Kirin Art High School work to achieve their dreams of becoming stars.It is made by KBS.It is written by Park Hye Ryun. The main character: Song Sam Dong, Hyun Si Hyuk, Go Hye Mi ,Yoon Baek Hee . Kim Pil Suk , Jason .Song Sam Dong is a country bumpkin who follows Hye Mi to Seoul after much convincing. He is a musical genius, but he is naive and has a hearing problem. Sam Dong is in love with Hye Mi,he defends her when her schoolmates turn on her, but starts to regret it all that he has done for her when he realizes Hye Mi has feelings for Jin Guk. 
Jin Guk is a childhood friend of Go Hye Mi and he constantly tries to help and save her. He mainly excels at dancing. He is in a love triangle with Go Hye Mi and Yoon Baek Hee. Because he performed with Baek Hee at the Showcase he has debuted with one of the top agencies. 
Go Hye Mi is the main character of this drama. In the beginning of this story she is portrayed as a cold-hearted girl who ditches her best friend, Yoon Baek Hee, to attend Kirin High Art School. Ironically, she is not accepted until later as one of the director's special students. Throughout the story she becomes nicer and expresses her feelings more. After being hurt by Go Hye Mi's harsh actions, she tries to get revenge on Hye Mi by becoming her greatest competitor. She is shaken when she realizes Go Hye Mi doesn't care about the competition anymore and just wants to be friends. She also has a crush on Jin Guk and is jealous that he likes Hye Mi. She becomes friends with Hye Mi again later on. 
She is a girl with an unfortunately fat appearance, but a beautiful voice. She has a major crush on Jason who rejected her. She promised that in 200 days she would lose 30kg while the time he is away from doing K activities. Later in 200 days she loses 30kg, and Jason is attracted to the new, slimmer, Pil Suk. They soon express their feelings for each otherJason is an American exchange student who excels mainly in dancing. He has good manners, but doesn't show much spirit. He does not like Pil Suk as much as she likes him in the beginning but after his debut, their relationship is unclear. According to Pil Suk, he has no goals in life. Through out the drama he starts to like Pil-Suk. The film has a happy ending 

- Hiện tượng phản xạ ánh sáng: 
+ Là hiện tượng tia sáng truyền từ môi trường trong suốt đến mặt phân cách thì bị hắt lại theo môi trường trong suốt cũ. 
+ Góc phản xạ bằng góc tới. 
- Hiện tượng khúc xạ ánh sáng: 
+ Là hiện tượng tia sáng truyền từ môi trường trong suốt này sang môi trường trong suốt khác bị gãy khúc tại mặt phân cách. 
+ Góc khúc xạ không bằng góc tới.

a*b=5*300=1500

a=5k, b=5k1

5k*5k1=1500

hay25*k*k1=1500k*k1=60 rồi ddawtjj từng trường hợp

Mình online nè

là sao?

SL:1561

SB:446

4. B

5. B

Sai rồi cậu ơi, tớ điền 8 mak chả đúng

Dear Lan

I'm having a good trip in Hanoi, Vietnam. It's an interesting place. My friend has shown me some famous places in Hanoi such as Hoan Kiem lake, Ho Chi Minh museum, Big Opera. People overt here is very friendly, kind and helpful. It's sunny and windy. I'm going to see a movie in National theater.

Wish you were here, 

Hao.