A nêu tác dụng của dòng điện B dòng điện chạy trong giây dẫn làm cho dây nóng lên đây là tác dụng gì của dòng điện có ích hay có hại

BÀI 5: Chuyển những câu bị động dưới đây về thể khẳng định (+), phủ định (-) và nghi vấn (?) ở thì hiện tại đơn. 1. (+) This table is made of wood. (-)__________________________________________. (?)__________________________________________? 2. (+)__________________________________________. (-) This book isn’t sold in many bookstores. (?)__________________________________________? 3. This gift is wrapped in colorful paper. (-)__________________________________________. (?)__________________________________________? 4. (+)__________________________________________. (-)__________________________________________. Are tickets sold at the entrance? 5. (+)__________________________________________. (-) The car isn’t polished regularly. (?)__________________________________________? 6. The grass is cut every week. (-)__________________________________________. (?)__________________________________________? 7. These tomatoes are grown in Mrs. Smith’s garden. (-)__________________________________________. (?)__________________________________________? 8. . (+)__________________________________________. (-)__________________________________________. Is the bank always closed at 4:30? Bài 6: Khoanh tròn vào đáp án đúng. 1. English is ( speak/ spoken) in many countries. 2. I (am not/ don’t) allowed to stay out too late. 3. These flowers are (watered/ waters) everyday by my mother. 4. The housework (are/ is) done by both of my parents. 5. The food ( is preparing/ is prepared) by Jane. 6. My mother ( is bought/ buys) me new clothese every month. 7. Mr Vu is (admiring/ admired) by many people. 8. May difficult exercises ( are done/ are doing) easily by Jim. 9. The air ( is polluted/ is polluting) by smoke from factories. 10. My glasses are ( broke/ broken). 11. These trees ( are planted/ are plants) by local people. 12. This report ( is typed/ typed) by my assistant. 13. English ( is studying/ is studied) by students at schools. 14. Cheese ( is made/ makes) from milk. 15. Breakfast is prepared ( by/ from) my mother everyday. Bai 7: Chia động từ trong ngoặc về thể bị động thì hiện tại đơn để hoàn thành đoạn văn sau: How sugar is made Sugar (1. normally make) _______________ from sugar cane. This kind of plant (2. grow) _______________ in tropical or subtropical areas. In such developed countries as the United States, harvesting of cane (3. do) _______________ mainly by machine. In other areas, this process (4. also do) _______________ by hand. After the cane (5. harvest) _______________ , it (6. load) _______________ mechanically into trucks or railroad and (7. take) _______________ to mills. Then it (8. process) _______________ into raw sugar. The cane (9. clean) _______________ by warm water before it (10. break) _______________ by two or three crusher rollers. A large part of the juice (11. extract) _______________ and then (12. purify) _______________ to make sugar crystals. In the next steps, sugar crystals (13. tumble) _______________ through heated air. After they (14. dry) _______________ ' they (15. sort) _______________ by size and (16. place) _______________ in storage bins. Sugar (17. pack) _______________ in the packages like we see in the supermarket . Sugar (18. use) _______________ for various purposes and it is a must-have. item in every kitchen. Bài 8: Dựa vào những từ cho sẵn, viết câu bị động ở thì hiện tại đơn. 1. My house/ make from/ wood . _________________________________________________________________ 2. These eggs/ not lay/ by my hens. _________________________________________________________________ 3. Morning exercises/ do/ Jim/ everyday. __________________________________________________________________ 4. The dogs/ feed/ jane/ every day. _________________________________________________________________ 5. Letters/ deliver/ mailman/ everyday. _________________________________________________________________ 6. Vegetables/ grow/ in the fields/ farmers. ________________________________________________________________ 7. Cattle / raise/ farm workers. _________________________________________________________________ 8. Many diseases/ cure/ by surgery/ nowadays. __________________________________________________________________ 9. National heritages/ preserve/ the government. __________________________________________________________________ 10. The architectural features of the house/ carefully study/ architects.

Tìm điều kiện của `a,b,n ∈ Q` để: `N = (x+a)(x+b)(x+a+n)(x+b+n)+k` 1) Phân tích được thành nhân tử. 2) Trở thành bình phương đúng.

Bai 9: Hoàn thành câu thứ hai dựa vào từ cho sẵn trng ngoặc. 0. my father washes the car once a month. ( is) The car is washed by my father once a month. 1. The painter displays all the paintings in the gallery. ( are) All the paintings __________________________________________________ 2. Jim turns off the kettle . ( by) The kettle________________________________________________________ 3. Peter always looks the door before 9 p.m ( locked) The door _________________________________________________________ 4. Does Jim take you to the airport? ( taken) Are you _________________________________________________________ 5. How ofte does Jane clean the room? ( is) How often _________________________________________________________ 6. My brother rarely write a long essay. ( is) A long essay _________________________________________________________ 7. My aunt arranges flowers beautifully. ( are) Flowers _________________________________________________________ 8. Mr. Smith sometimes drive the new car to work. (is) The new car _________________________________________________________ 9. I never speak English outside the classroom. ( by) English _________________________________________________________ 10/ People never open this gate. ( is) The gate_________________________________________________________ 11. people make bottles from plastic. ( are) Bottles _________________________________________________________ 12. Jane hangs the wedding photo on the wall. (by ) The wedding photo _________________________________________________________ 13. Someone guard this place twenty-four hour a day. ( is) This place _________________________________________________________ 14. Jim writes and posts his blog on social network site. ( is) Jim’s blog _________________________________________________________ 15. People harvest winter wheat in late July ( is) Winter_________________________________________________________ Bài 10: Chuyển những câu bị động sau thành câu chủ động. 1. I am taken to school by my father every day. ________________________________________________________________. 2. This book is read by a large number of people. ________________________________________________________________. 3. The President is warmly welcomed by the citizens. ________________________________________________________________. 4. You are invited to the party by Jim. ________________________________________________________________. 5. Chocolate is loved by many children. ________________________________________________________________. 6. Historic places in my hometown are protected by the authorities. ________________________________________________________________. 7. This old man is visited regularly by his grandchildren. ________________________________________________________________. 8. The letter is accidentally torn by me. ________________________________________________________________. 9. This problem is cleatly explained by my teacher. ________________________________________________________________. 10. The vase is placed under the table by my mother. ________________________________________________________________.

E = x ² - 6x + 3 ; F = 5x ² + 10x + 2015 ; C = 5x ² + 4y ² - 4xy + 10x - 12y + 2031 Tìm giá trị nhỏ nhất ( các bạn giúp mik nhé =))

Tìm điều kiện của a và M để `M = (x-a)(x-2a)(x-3a)(x-4a) + m` phân tích được thành nhân tử. Đa thức `H = (x-2)(x-4)(x-6)(x-8) + 4` có phân tích được thành nhân tử không?

1 chiếc xuồng chạy xuôi dòng từ A->B biết AB 18km, vận tốc xuồng so vs nc là 80km/h. Hỏi sau bao lâu đến B a) Nước ko chảy b) Nước chảy từ A->B vs vận tốc 4km.Tìm thời gian cả đi và về

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tìm điều kiện xác định và biểu diễn trên trục só ạ a) $\sqrt{(x-2)(x-3) }$ b) $\sqrt{x^{2}-x-12 }$ c) $\sqrt{x^{2}-x-30}$ d) $\sqrt{3x^{2}-7x+4}$ e) $\sqrt{4x^{2}-6x+2}$

Với những hiểu biết thực tế, viết một đoạn văn (khoảng nửa trang giấy thi) nêu suy nghĩ của em về truyền thống đấu tranh của dân tộc Việt Nam ta. Giúp mik vs ạ , mik đang cần gấp