Chủ đề:
Đại số lớp 7Câu hỏi:
Tìm số hữu tỉ x, biết rằng:
a. \(\dfrac{x+1}{10}+\dfrac{x+1}{11}+\dfrac{x+1}{12}=\dfrac{x+1}{13}+\dfrac{x+1}{14}\)
b. \(\dfrac{x+4}{2000}+\dfrac{x+3}{2001}=\dfrac{x+2}{2002}+\dfrac{x+1}{2003}\)
Tìm lỗi sai:
1. | The ground felt so smooth that I had no need for a mattress, I laid downand went to sleep effortlessly. | |
2. | Before arriving at the airport, he had taken off his coat and throwed it over his shoulder, complaining of the heat. | |
3. | Conditions in the country has grown so severe that many refugees have risked death to escape. | |
4. | A man who can win two elections uncontested is a man who's character isfirmly established. | |
5. | If anyone happens to call while I am out of the office, please have themleave a message for me. | |
6. | With less than three inches of rain falling in a six-month period, the farmers found it necessary to irrigate the land. | |
7. | The principle reason for the great amount of pollution is that government does not take the lead in passing strong legislation against it. | |
8. | The servant returned with a message for which I was not in the leastpreparing: my host would be unable to receive me because of his ill health. | |
9. | It is necessary that a person drink several glasses of the water daily if he wishes to remain healthy. | |
10. | The patient's doctor strongly urges that he has an operation on his back as soon as his general health improves. |
Tìm lỗi sai:
1. | The reason he has been such a success is because he never gives up. | |
2. | For hundreds of years the Indian tribe has wandered the valleys and mountains during the spring, and in winter have begun the trip home. | |
3. | He said that being a king was dangerous, like he were sitting on top of a mountain waiting to be pushed off. | |
4. | By the time we had pulled the drowning child from the water, he wasn't scarcely breathing. | |
5. | It is important to lock one's doors at night and do not let anyone enterunless he identifies himself. | |
6. | I cannot help admiring a person who does not continually cry about theirproblems. | |
7. | While I was explaining my purpose, she looked uneasy; but in the end she made no objection of it. | |
8. | Before she began to feel any stronger, she had taken most all the medicine prescribed by the doctor. | |
9. | We knew that they would have more trouble getting there on time than us. | |
10. | She felt badly about breaking the new watch which my parents had given me for my sixteenth birthday. |
1. | I was surprised I passed the exam. I didn't expect ____________. | |
2. | Did you manage to solve the problem ? Did you succeed ____________ ? | |
3. | I don't read newspapers any more. I've given up ____________. | |
4. | I'd prefer not to go out tonight. I'd rather ____________. | |
5. | He can't walk very well. He has difficulty ____________. | |
6. | Shall I phone you this evening ? Do you want ____________ ? | |
7. | Nobody saw me come in. I came in without ____________. | |
8. | They said I was a cheat. I was accused ____________. | |
9. | It will be good to see them again. I'm looking forward ____________. | |
10. | What do you think I should do ? What do you advise me ____________ ? |