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cho 5 điểm trong đó có 3 điểm không thằng hàng . Vẽ những đường thẳng đi qua 5 điểm đó . Hỏi có tất cả bao nhiêu đường
bài giải là
có tất cả 5*4:2 = 10
bạn ơi mk dịch lộn một chút là vẽ đường thẳng đi qua 2 trong 5 điểm đó . hỏi có tất cả bao nhiêu đường
Chọn 1 điểm , làm như vậy với 4 điểm còn lại . ta có 5.4 đt nhưng lại bị lặp 2 làn nên có 5.4:2 = 10 đt
Dịch :
Cho 5 điểm trong đó không có ba điểm thẳng hàng. Vẽ đường thẳng đi qua các cặp điểm . Có bao nhiêu đường thẳng ?
1.The girls are playing tennis at the moment
2.John always goes ro chool by car
3.What do you doin the afternoon ?
4.They are chatting in the class now
5.My sister doesn't buy a new car
1. at/ tennis/ The girls/ playing/ the moment/ are
=> The girls are playing tennis at the moment.
2. always/ by/ Jonh/ goes to/ car/ school
=> Jonh always goes to school by car.
3. do/ in/ What/ you/ the afternoon/ do/ ?
=> What do you do in the afternoon?
4. chatting/ the class/ are/ They/ in/ now
=> They are chatting in the class now.
5. doesn't/ a new car / buy/ sister/ My
=> My sister doesn't buy a new car.
1. A The young singer is bringing out a new ........record............. called "Forever Love".
B The police are keeping a ......record...............of all cars which entered the area.
C It's difficult for anyone with a criminal...........record........ to get a job.
2. A With one blow he.........drove ............ the nail into the plank.
B Failure......drove............... him to such despair that he could hardly get over.
C The man.......drove..... the van up to the front door of the warehouse.
3. A Her family planned to....hammered...............her at the Christmas debutante all in New York.
B. She wants to.........hammered............ as a pleasant young woman.
C. He gave Brian a......hammered............... with the understanding that he would appreciate it until a later date.
4. A As we round the bend, the first few houses came into......view..............
B There is a widespread........view............. that too much sugar is bad for you.
C The prize-winning sculpture is on..........view........... at the National Gallery this week.
5. A The team did so ..........badly........... that they hardly reached the quarter-finals.
B Some of our trees were..........badly........... damaged in the storm.
C The roof has been leaking for some time and is...........badly.......... in need of repair.