Mô đun của với x ∈ R là?A. 1 B. 2 C. D. 1 + x2
Gọi $\displaystyle {{z}_{1}},{{z}_{2}}$ là hai nghiệm phức của phương trình$\displaystyle {{z}^{2}}+4z+7=0$ . Khi đó$\displaystyle {{\left| {{z}_{1}} \right|}^{2}}+{{\left| {{z}_{2}} \right|}^{2}}$ bằngA. 10 . B. 7 . C. 14 . D. 21.
Phần ảo của số phức z thỏa mãn $\displaystyle z+2\overline{z}={{\left( 2-i \right)}^{3}}\left( 1-i \right)$ làA. $\displaystyle 13.$ B. $\displaystyle -13.$ C. $-9.$ D. $\displaystyle 9.$
Trong mặt phẳng phức, tập hợp điểm M(x ; y) là biểu diễn của số phức z = x + iy thoả mãn|z + 1 + 3i| = |z - 2 - i|(1) làA. Đường tròn tâm O bán kính R = 1 B. Đường tròn đường kính AB với A(-1 ; -3), B(2 ; 1) C. Đường trung trực của đoạn thẳng AB với A(-1 ; -3), B(2 ; 1) D. Đường thẳng vuông góc với đoạn AB với A(-1 ; -3), B(2 ; 1) tại A.
A. B. C. D.
Cho hai số phức u = 3x + 2yi và v = 2y + 3xi. Trong mặt phẳng phức Oxy, tập hợp điểm biểu diễn của sốphức z = u + v là kết quả nào sau đây ?A. Trục Oy B. Tia Oy (với y > 0) C. Đường tròn tâm O bán kính R = 1 D. Đường thẳng y = x.
Choose a word that has different stress pattern:fascinating occasionally communicate behaviorA. fascinating B. occasionally C. communicate D. behavior
Choose the correct sentence which is built from the words and phrases given:I / busy / prepare / my English examination / next week.A. I was busy as preparing for my English examination next week. B. I will be busy to prepare for my English examination next week. C. I am too busy to prepare for my English examination next week. D. I am busy preparing for my English examination next week.
Find a mistake in the four underlined parts of the sentence and correct it:My father and brother like watching football matches on TV whatever they have free time.A. watching B. matches C. on D. whatever
Read the passage below and choose one correct answer for each question: My name is Seumas McSporran and I’m a very busy man. I’m 60 years old and I have thirteen jobs. I am a postman, a politician, a fireman, a taxi driver, a school-bus driver, a boatman, an ambulance man, an accountant, a petrol attendant, a barman, and an undertaker. Also, I and my wife, Margaret, have a shop and a small hotel. I live and work on the island of Gigha in the west of Scotland. Only 20 people live there but in summer 150 tourists come by boat every day. Every weekday I get up at 6.00 and makes breakfast for the hotel guests. At 8.00 I drive the island’s children to school. At 9.00 I collect the post from the boat and deliver it to all the houses on the island. I also deliver the beer to the island’s only pub. Then I help Margaret in the shop. My wife likes being busy. too. We never have holidays and we don’t watch television. In the evenings Margaret makes supper and I do the accounts. At 10.00 we have a glass of wine and then we go to bed. Perhaps our life isn’t very exciting, but we like it. 1. Mr. McSporran does all the following jobs EXCEPT .A. a firefighter B. a driver C. a farmer D. a mailman2. Giaha is the name of ______________A. his wife B. his hotelC. the shop where they work D. the island where they live3. Tourists _____________ to the island.A. sail B. fly C. swim D. drive4. The word “it” in paragraph 3 refer to ________________.A. beer B. post C. boat D. pub5. According to the passage which is true about Seumas McSporran?A. He likes the job as a postman most.B. He and his wife go on holiday every year.C. He does the accounts in the evening.D. He goes to bed very late. A. 1. C 2. D 3. A 4. B 5. D B. 1. C 2. D 3. A 4. B 5. C C. 1. C 2. D 3. B 4. B 5. C D. 1. C 2. D 3. A 4. D 5. C
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