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3: góc AMN=góic ACM
=>AM là tiếp tuyến của đường tròn ngoại tiếp ΔECM
=>góc AMB=90 độ
=>Tâm o1 của đường tròn ngoại tiếp ΔECM nằm trên BM
NO1 min khi NO1=d(N;BM)
=>NO1 vuông góc BM
Gọi O1 là chân đường vuông góc kẻ từ N xuống BM
=>O1 là tâm đường tròn ngoại tiếp ΔECM có bán kính là O1M
=>d(N;tâm đường tròn ngoại tiếp ΔECM) nhỏ nhất khi C là giao của (O1;O1M) với (O) với O1 ;là hình chiếu vuông góc của N trên BM
1 If I were Quang, I would study hard for the upcoming exam
2 The river in which the children prefer to swim is clean
3 The car which Mrs Brown has just bought is fast and modern
4 Mr Nick suggested changing the date of the meeting until next month
5 My nephew enjoyed feeding fish every morning
6 You won't pay much per month if you save energy
7 If the car weren't too expensive for us to buy
8 In spite of the heavy traffic, they got there in time
9 The movie which the kids were watching is interesting
23 , Has / knocked
24 , Have / left
25 , Has - seen / has - seen
26 , Have / been
27 , have read
28 , has / seen
29 , have / eaten
30 , has / catted
31 , have / seen
32 , .......
33 , has / studied
34 , have / studied
35 , have / known / have known
36 , Have / been / have been
37 , haven't seen
23. Has- knocked
24. Have - left
25. Has - seen / has - seen
26. Have - been
27. have read
28.has - seen
29. have - eaten
30. has - eaten
31. have - seen
32. has killed
33. has - lived
34. have - studied
35. have - known / have known
36. have - been / have been
37. haven't seen
-HT-