Cho △ABC có a=3, b=7, c=7. Tính góc C, đường cao h_a , đường trung tuyến m_{b , S, R và r}

Cho pt : x^2-2(m-1)x-5=0 , giải pt với m=1 tìm m 

children should not be allowed to watch ... from pollution

a. ordinary b. compulsory c. unique d. violent 

children should not be allowed to watch ... from pollution

a. ordinary b. compulsory c. unique d. violent 

1. she has been working as a secretary for the this firm since 2018

→ she started 

2. no other players of our group can play soccer more skillfully than tim

→ tim is

3. " why not go to my house for dinner, Tina ? " John said. 

→ John suggested that ...

4. Mr. Brown is a nice teacher. We studied with him last year 

→ Mr. Brown 

1. They stay at luxurious hotels, drive smart cars and dress .... ( fashion)

2. After being ... by the aliens, the groups of explorers were freed ( examine )

3. Let's buy some champange in ... of her safe arrival ( celebrate)

4. Before the real test, the ... are given a simple practive exercise ( exam )

5. So far, our ...old car has gone 150,000 miles ( trust )

6. The response to our advertisement has been somewhat ... ( disappoint )

7. Watching Korean films on TV is a time - ... activity ( consume )

8. This group is concerned about the ... of the natural environment ( conserve )

9. If we go on littering, the environment will become ... polluted ( serious )

10. Those pollutants have ... the lives of many seabirds in the past few years (danger)

11. He is an ... doctor who's just graduated from the medical school ( experience )

12. The ... of earthquake occur around the Pacific Rim ( major )