x² - 5x + 6 = 0
⇔ x² - 2x - 3x + 6 = 0
⇔ x(x - 2) - 3(x - 2) = 0
⇔ (x - 2).(x - 3) = 0
⇔ x - 2 = 0 hoặc x - 3 = 0
* x - 2 = 0
x = 2
* x - 3 = 0
x = 3
Vậy pt có tập nghiệm: S = {2; 3}
chứng minh rằng phân số sau tối giản với mọi m thuộc số từ nhiên khác 0 4m+3/5m+4
giúp em giải nhá em cám ơn nhìu !!!
Cong thuc cau tao cua cac chat huu co sau C2H6O ; C2H4; C3H8
Mn giải giúp e c3.4 vs ak♥️♥️ thanks
30 Mark the letter A, B, C or D on your answer sheet to indicate the meaningful sentence from the cues given. Would/ mind/ I/ ask/ question? A: Would you mind if I will ask you a question? B: Would you mind if I ask you a question? C: Would you mind if I asking you a question? D: Would you mind if I asked you a question? 31 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 blank (27). The United States has many different types of families. While most American families are traditional, (23)_______ a father, a mother and one or more children, 22 percent of all American families in 1998 were headed by one parent, usually a woman. In a few families in the United States, there are no children. These (24) _______ couples may believe that they would not make good parents; they may want freedom from responsibilities of childbearing; or, perhaps they (25)_______ physically able to have children. Other families in the United States have one adult (26)_______ a stepparent. A stepmother or stepfather is a person who joins a family by marrying a father or a mother. Americans tolerate and accept these different types of families. In the United States people have right to privacy and Americans do not believe in telling other Americans what type of family group they must belong to. They respect each other’s choices regarding family groups. Families are very important (27)_______ Americans. A: in B: to C: for D: of 32 Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. Mrs. Lan doesn’t walk to work because she doesn’t live near the office. A: Mrs. Lan would walk to work if she lived near the office. B: If Mrs. Lan lived near the office, she wouldn’t walk to work. C: Mrs. Lan will walk to work if she doesn’t live near the office. D: Mrs. Lan walks to work if she lives near the office. 33 Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. If you are invited to an American friend"s home for dinner, remember these general rules for polite behavior. First of all, arrive approximately on time, but not early. Americans expect promptness. It will be all right to be 10 or 15 minutes late but not 45 minutes late. Dinner might be over-cooked and ruined by then. When you are invited to someone"s home for a meal, it’s polite to bring a small gift. Flowers or candy are always appropriate. If you have an attractive thing made in your native country, your host or hostess will certainly enjoy receiving that gift. What will you do if you are served some food that you cannot eat or you do not like? Do not make a fuss about it. Simply eat what you can and hope that no one notices it. Be sure to compliment the cook on the food that you are enjoying. Do not leave immediately after dinner, but do not overstay your welcome, either. The next day, call or write a thank-you note to stay how much you enjoyed the evening. The next day, _______________. A: invite the host to your house B: remember to thank to the host for dinner C: you needn"t say thank- you D: say nothing to the host 34 Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions. I think we should put different kinds of waste in different baskets. A: I suggest to put different kinds of waste in different baskets. B: I suggest we have to put different kinds of waste in different baskets. C: I suggest we shall put different kinds of waste in different baskets. D: I suggest putting different kinds of waste in different baskets.
Lấy năm ví dụ về môi trường trong đất
Viết một đoạn thuyết minh về quê hương ( giới thiệu quê hương em) CÀ MAU VĂN THUYẾT MINH
Viết một đoạn văn ngắn(khoảng 5-7 câu) tả cảnh quê hương em, trong đó có một vài câu đặc biệt.
Exercise 5. Complete the sentences with the correct tense of the verbs in brackets. Use the past simple or the present perfect tenses. 1. I’m really hungry. I ______________ (not have) lunch yet. 2. We ______________ (not have) a maths class last week. 3. Keith’s not home now. He ______________ (go) to the beach this weekend. 4. My family ______________ (move) to Canada in 2010. 5. _________ you ever __________ (visit) San Adarino? 6. He ______________ (live) in London for two years when he was a student. 7. __________ Jenny __________ (go) to the dentist yesterday? 8. They ______________ (work) in this company since 2001. 9. _________ you __________ (see) Joana recently? 10. Jim ______________ (break)his leg in a skiing accident two years ago.
Tìm trong các văn bản truyện ngắn "Bến tre" ,"Những ngôi sao xa xôi" các câu văn có chứa các thành phần biệt lập mà em đã học
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