Cho tập hợp x = 2 3 4 5 hỏi tập hợp x có bao nhiêu tập hợp con

Cho tập (X = ( (2;3;4) ). ) Hỏi tập (X ) có bao nhiêu tập hợp con?

Câu 60836 Thông hiểu

Cho tập \(X = \left\{ {2;3;4} \right\}.\) Hỏi tập \(X\) có bao nhiêu tập hợp con?

Đáp án đúng: c

Phương pháp giải

Số tập con của tập hợp gồm \(n\) phần tử là \({2^n}\).

Tập hợp --- Xem chi tiết

Cho tậpX=2;3;4. Hỏi tập X có bao nhiêu tập hợp con?

A. 3

B. 6

C. 8

Đáp án chính xác

D. 9

Xem lời giải

Cho tập X=2,3,4. Hỏi tập X có bao nhiêu tập hợp con?

A.8.

B.7.

C.6.

D.5.

Đáp án và lời giải

Đáp án:A

Lời giải:Lời giải
Chọn A
CâuB sai vì thiếu tập hợp rỗng.
CâuC, D vì không liệt kê hết các tập hợp con.

Vậy đáp án đúng là A.

Chia sẻ

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  Question 25:

• 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 lifeand all it has to offer. Optimists are more (26)_______to start new projects and generally more prepared to takerisks. 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 theirlives.

  Question 22:

• 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 lifeand all it has to offer. Optimists are more (26)_______to start new projects and generally more prepared to takerisks. 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 theirlives.

  Question 23:

• 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 lifeand all it has to offer. Optimists are more (26)_______to start new projects and generally more prepared to takerisks. 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 theirlives.

  Question21:

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  Question 28:

• 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 lifeand all it has to offer . Optimists are more (26)_______to start new projects and generally more prepared to takerisks. 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 theirlives.

  Question 29:

• Read the following passage 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 31 to 35:

  Nowadays people are more aware that wildlife all over the world is in (31)___________. Many species of animals are threatened, and could easily become (32)___________ if we do not make an effort to protect them. There are many reasons for this. In some cases animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (33)___________, and sold as pets. For many animals and birds, the problem is that their habitats-the place where they live-is disappearing. More land is used for farm, for houses and industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them grow better crops, but these chemicals pollute the environment and (34)___________ wildlife. The most successful animals on Earth, human beings, will soon be the only ones (35)___________ unless we can solve this problem.

  Question 35:

• Read the following passage 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 31 to 35:

  Nowadays people are more aware that wildlife all over the world is in (31)___________. Many species of animals are threatened, and could easily become (32)___________ if we do not make an effort to protect them. There are many reasons for this. In some cases animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (33)___________, and sold as pets. For many animals and birds, the problem is that their habitats-the place where they live-is disappearing. More land is used for farm, for houses and industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them grow better crops, but these chemicals pollute the environment and (34)___________ wildlife. The most successful animals on Earth, human beings, will soon be the only ones (35)___________ unless we can solve this problem.

  Question 33:

• Read the following passage 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 31 to 35:

  Nowadays people are more aware that wildlife all over the world is in (31)___________. Many species of animals are threatened, and could easily become (32)___________ if we do not make an effort to protect them. There are many reasons for this. In some cases animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (33)___________, and sold as pets. For many animals and birds, the problem is that their habitats-the place where they live-is disappearing. More land is used for farm, for houses and industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them grow better crops, but these chemicals pollute the environment and (34)___________ wildlife. The most successful animals on Earth, human beings, will soon be the only ones (35)___________ unless we can solve this problem.

  Question 34:

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  Question 31:

Cho tập hợp : A = {1; 2; 3; 4}a) Viết các tập hợp con của A mà mọi phần tử của nó đều là số chẵn.b) Viết các tập hợp con của A.

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