Mệnh đề không phải là mệnh đề kéo theo trong các mệnh đề sau là
(a) Mỗi điểm nằm trên đường trung trực của một đoạn thẳng thì cách đều hai đầu mút của đoạn thẳng đó.
(b) Điểm cách đều hai đầu mút của một đoạn thẳng thì nằm trên đường trung trực của đoạn thẳng đó.
(c) Mỗi số vô tỉ đều là số thực.
(d) Hàm số y = 2x² nghịch biến trên khoảng (-∞ ; 0) và đồng biến trên khoảng (0 ; +∞).
(h) Nếu a > 0 thì hàm số y = ax nghịch biến trên khoảng (-∞ ; 0) và đồng biến trên khoảng (0 ; +∞).

Xác định tập hợp B = {x ∈ Z / -2 ≤ x < 3} bằng cách liệt kê các phần tử.

Cho hai tập hợp A = {0 ; 2} và B = {0 ; 1 ; 2 ; 3 ; 4} . Số tập hợp X thỏa mãn A ∪ X = B là

Câu sau đây đúng là

Cho biết 1mm³ máu người chứa khoảng 5 triệu hồng cầu và mỗi người trung bình có khoảng 6 lít máu. Số hồng cầu của mỗi người là

Dân số một nước được cho dưới dạng chuẩn là: 82245.10³. Một bạn viết số dân nước đó là : 82245996. Khẳng định sai là

Trong các câu sau đây,mệnh đề là
(a) Một số tự nhiên n là tích của hai số nguyên dương khác n và khác 1 được gọi là m ột hợp số;
(b) Mỗi số tự nhiên khác 1 đều viết được dưới dạng tích những số nguyên tố;
(c) Trong một tam giác, độ dài mỗi cạnh nhỏ hơn tổng độ dài hai cạnh còn lại;
(d) Phương trình x³ + x + 1 có nghiệm là một số thực hay không?
(e) Định lí Py-ta-go quả là rất đẹp!

Cho tập hợp S = {x ∈ R | x² - 3x + 2 = 0}. Kết quả đúng trong các kết quả sau đây:

Mệnh đề không phải là mệnh đề kéo theo trong các mệnh đề sau là
(a) Mỗi điểm nằm trên đường trung trực của một đoạn thẳng thì cách đều hai đầu mút của đoạn thẳng đó.
(b) Điểm cách đều hai đầu mút của một đoạn thẳng thì nằm trên đường trung trực của đoạn thẳng đó.
(c) Mỗi số vô tỉ đều là số thực.
(d) Hàm số y = 2x² nghịch biến trên khoảng (-∞ ; 0) và đồng biến trên khoảng (0 ; +∞).
(h) Nếu a > 0 thì hàm số y = ax nghịch biến trên khoảng (-∞ ; 0) và đồng biến trên khoảng (0 ; +∞).

Cho ba tập hợp A = {a ; b ; c}, B = {b ; c ; d}, C = {b ; c ; e} (trong đó a, b, c, d, e là các số đôi một phân biệt). Xét bốn đẳng thức tập hợp sau, đẳng thức sai là 
I. A ∩ ( B ∪ C) = (A ∪ B) ∩ (A ∪ C).
II. A ∩ (B ∪ C) = (A ∪ B) ∩ C.
III. (A ∩ C) ∪ B = (A ∩ B) ∪ (A ∩ C).
IV. (A ∩ C) ∪ B = (A ∪ C) ∩ B.

Số gần đúng a = 25,3785 có bốn chữ số đáng tin đưọc viết dưới dạng chuẩn là :

Choose the word or phrase (A, B, C or D) that best fits the blank space in the following passage:

                                                               LOOK ON THE BRIGHT SIDE       

Do you ever wish you were more optimistic, some one who always (21)_____ to be successful? Having some one around who always fears the worst isn’t really a lot of (22)_____we all know someone who sees a single cloud on a sunny day and says: “It looks like rain.”. But if you catch yourself thinking such things, it’s important to do something (23)_____ it. You can change your view of life, (24)_____ to psychologists, it only takes a little effort, and you’ll find life more rewarding as a (25)______. Optimism, they say, is partly about self-respect and confidence, but it’s also a more positive way of looking at life and all it has to offer . Optimists are more (26)_______to start new projects and generally more prepared to take risks. Upbringing is obviously very important in forming your (27)_______ to the world. Some people are brought up to (28)______too much on others and grow up forever blaming other people when anything goes wrong. Most optimists, on the (29) _____hand, have been brought up not to regard failure as the end of the world - they just (30)_____with their lives.  

Question 30:

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 7 to 11:

 When you first apply for a job, you (7)_____not succeed in getting it. It’s always a good (8)_____to ask them to explain to you what prevent you from beating the other candidates. Don’t complain about the situation, but ask them to advise you (9)______what you can do better next time. Perhaps the interviewer disapproved of or disagree with something you said. Perhaps they just glanced at your application and saw something that made it easy to choose between you and another candidate. Don’t regard it as a failure, but recognize it as a chance to learn more. (10)______you don’t worry too much about it and continue to believe in yourself, you’ll eventually find the chance you’ve been waiting for. Then, your family and friends will be able to (11)______you on your success.  

Question 10:

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 7 to 11:

 When you first apply for a job, you (7)_____not succeed in getting it. It’s always a good (8)_____to ask them to explain to you what prevent you from beating the other candidates. Don’t complain about the situation, but ask them to advise you (9)______what you can do better next time. Perhaps the interviewer disapproved of or disagree with something you said. Perhaps they just glanced at your application and saw something that made it easy to choose between you and another candidate. Don’t regard it as a failure, but recognize it as a chance to learn more. (10)______you don’t worry too much about it and continue to believe in yourself, you’ll eventually find the chance you’ve been waiting for. Then, your family and friends will be able to (11)______you on your success.  

Question 8:

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 7 to 11:

 When you first apply for a job, you (7)_____not succeed in getting it. It’s always a good (8)_____to ask them to explain to you what prevent you from beating the other candidates. Don’t complain about the situation, but ask them to advise you (9)______what you can do better next time. Perhaps the interviewer disapproved of or disagree with something you said. Perhaps they just glanced at your application and saw something that made it easy to choose between you and another candidate. Don’t regard it as a failure, but recognize it as a chance to learn more. (10)______you don’t worry too much about it and continue to believe in yourself, you’ll eventually find the chance you’ve been waiting for. Then, your family and friends will be able to (11)______you on your success.  

Question 7:

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 7 to 11:

 When you first apply for a job, you (7)_____not succeed in getting it. It’s always a good (8)_____to ask them to explain to you what prevent you from beating the other candidates. Don’t complain about the situation, but ask them to advise you (9)______what you can do better next time. Perhaps the interviewer disapproved of or disagree with something you said. Perhaps they just glanced at your application and saw something that made it easy to choose between you and another candidate. Don’t regard it as a failure, but recognize it as a chance to learn more. (10)______you don’t worry too much about it and continue to believe in yourself, you’ll eventually find the chance you’ve been waiting for. Then, your family and friends will be able to (11)______you on your success.  

Question 11:

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

In the 1998 World Cup, sports fans around the world (31) ________ various battles between fierce football rivals but also between the companies that sponsored them. Nike sponsored Brazil. Adidas sponsored France. While the teams (32) ________ for the biggest prize in football, the two companies tried to win the biggest battle, the battle of the brands as 500 million people from 195 countries turn in to watch the greatest footballers in the world. Afterwards, the sportswear companies' hope was for people to go out and buy some new kits. Adidas paid $20 million for the privilege of being an official sponsor of the 1998 World Cup and so one might have assumed it would have had the greatest presence at the (33) ________. Sometimes, however, sponsoring doesn’t (34) ________ the company much good. Other times, the sponsors’ advertising campaigns are very original. Nike has claimed that if sponsors really want to support athletes, they can’t turn up only for the photo opportunities and the media events and smile and (35) ________ for the cameras. They have to accept the whole package with its spitting, swearing, sweating and blistering-breaking. They just have to get used to it.  

Question 33:          

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

In the 1998 World Cup, sports fans around the world (31) ________ various battles between fierce football rivals but also between the companies that sponsored them. Nike sponsored Brazil. Adidas sponsored France. While the teams (32) ________ for the biggest prize in football, the two companies tried to win the biggest battle, the battle of the brands as 500 million people from 195 countries turn in to watch the greatest footballers in the world. Afterwards, the sportswear companies' hope was for people to go out and buy some new kits. Adidas paid $20 million for the privilege of being an official sponsor of the 1998 World Cup and so one might have assumed it would have had the greatest presence at the (33) ________. Sometimes, however, sponsoring doesn’t (34) ________ the company much good. Other times, the sponsors’ advertising campaigns are very original. Nike has claimed that if sponsors really want to support athletes, they can’t turn up only for the photo opportunities and the media events and smile and (35) ________ for the cameras. They have to accept the whole package with its spitting, swearing, sweating and blistering-breaking. They just have to get used to it.  

Question 32:        

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

GLOBAL WARMING

Few people now question the reality of global warming and its effects on the world’s climate. Many scientists (31) ________ the blame for recent natural disasters on the increase in the world’s temperatures and are convinced that, more than ever before, the Earth is at risk from the forces of the wind, rain and sun. (32) ________ to them, global warming is making extreme weather events, such as hurricanes and droughts, even more (33) ________ and causing sea levels all around the world to rise. Environmental groups are putting pressure on governments to take action to reduce the amount of carbon dioxide which is given (34) ________ by factories and power plants, thus attacking the problem at its source. They are in favor of more money being spent on research into solar, wind and wave energy devices, which could then replace existing power station. Some scientists, (35) ________, believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the results. Global warming, it seems, is to stay.  

Question 31:        

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

GLOBAL WARMING

Few people now question the reality of global warming and its effects on the world’s climate. Many scientists (31) ________ the blame for recent natural disasters on the increase in the world’s temperatures and are convinced that, more than ever before, the Earth is at risk from the forces of the wind, rain and sun. (32) ________ to them, global warming is making extreme weather events, such as hurricanes and droughts, even more (33) ________ and causing sea levels all around the world to rise. Environmental groups are putting pressure on governments to take action to reduce the amount of carbon dioxide which is given (34) ________ by factories and power plants, thus attacking the problem at its source. They are in favor of more money being spent on research into solar, wind and wave energy devices, which could then replace existing power station. Some scientists, (35) ________, believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the results. Global warming, it seems, is to stay.  

Question 32:        

Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

GLOBAL WARMING

Few people now question the reality of global warming and its effects on the world’s climate. Many scientists (31) ________ the blame for recent natural disasters on the increase in the world’s temperatures and are convinced that, more than ever before, the Earth is at risk from the forces of the wind, rain and sun. (32) ________ to them, global warming is making extreme weather events, such as hurricanes and droughts, even more (33) ________ and causing sea levels all around the world to rise. Environmental groups are putting pressure on governments to take action to reduce the amount of carbon dioxide which is given (34) ________ by factories and power plants, thus attacking the problem at its source. They are in favor of more money being spent on research into solar, wind and wave energy devices, which could then replace existing power station. Some scientists, (35) ________, believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the results. Global warming, it seems, is to stay.  

Question 33: