Đáp án:2a
Giải thích các bước giải:a+b-c+a-b+c-b-c+a-a+b+c=2a
Chúc bạn làm tốt!!!
$ (a+b-c)+(a-b+c)-(b+c-a)-(a-b-c)$
$=a+b-c+a-b+c-b-c+a-a+b+c$
$=2a$
IV.Choose the best word or phrase (A,B,C or D) to complete each sentences. 16. My father is watching TV in the while my mother is cooking in the ______. A. living room/bedroom B. bedroom/bathroom C. living room/kitchen D. kitchen/hall 17. His uncle climbs the ladder and puts old things in the . A. attic B. toilet C. hall D. bathroom 18. Many people live in in mountainous areas to avoid dangerous animals. A. town houses B. villas C. stilt houses D. apartment 19. It’s so hot in my living room because the was broken. A. fridge B. air-conditioner C. dishwasher D. cooker 20. You should tidy up your clothesin the they seem so messy. A. sofa B. cupboard C. sink D. wardrobe 21. She places her alnums and magazines on the in her bedroom. A. bookshelf B. celling fan C. fireplace D. bed 22. He opened all the of drawers to find his wallet. A. cupboard B. stools C. baths D. chests 23. My brother hangs some of his favourite singers on the wall in his bedroom. A. books B. lights C. posters D. vases 24. a carpet and two lamps in his living room. A. They’re B. There are C. It’s D. There’s 25. a lot of pictures in her living room.They’re so beautiful. A. It’s B. There’s C. they’re D. There are 26. Her kithen is so small. any big cupboards there. A. There isn’t B. It isn’t C. There aren’t D. They are 27. My cat is the armchair,and my dog is the table in my living room. A. in/under B. on/at C. on/in D. in/between 28. The bed is the lamp and the wardrobe,and the pillows are the bed in this bedroom. A. next to/in front of B. between/on C. behind/in D. in/under 29. Your gloves are the computer.They should be the washing machine because they are so dirty. A. under/on B. behind/in C. in front of/on D. in/next to 30. His puppy’s kennel is the tree,and the tree is the fence in my garden. A. next to/in front of B. on/behind C. between/under D. next to/in
Choose the best option A, B, C or D to complete the sentence. 1. Minh used to____________his homework late in the evening. A. does B. do C. doing D. did 2. If people___________the rules, there are no more accidents. A. follow B. take care of C. obey D. remember 3. You should____________right and left when you go across the roads. A. see B. look C. be D. take 4. Hurry up or we can't____________the last bus home. A. keep B. follow C. go D. catch 5. Lan used to go to school____________ A. with bicycle B. by foot C. in car D. by bus 6. Public_____________in my town is good and cheap. A. transport B. tour C. journey D. travel 7._____________is not very far from here to the city centre. A. That B. This C. It D. There 8. When there is a traffic jam, it______________me a very long time to reach home. A. costs B. takes C. lasts D. spends 9. Mai's dad usually drives her to school____________her school is not very far from her house. A. but B. though C. because D. or 10. Yesterday Hoa and Lan______________round West Lake. It took them an hour. A. cycle B. cycles C. cycling D. cycled P/s: mình ko giỏi Tiếng Anh nên nhờ mn giúp, vote 5 SAO nhé <3
Giúp mình part 3 part 4 với ạ :)) Hứa vote đầy đủ ạ
Một mảnh đất hình tam giác có đáy 34m, chiều cao là 12m. Ở giữa người ta đào một cái ao hình tròn có đường kính là 5m. Tính diện tích đất còn lại
Ai giúp em với ạ chứ em quên hết kiến thức rồi.:((
Cáchc mạng ở miền Băc đã hoàn thành các nhiệm vụ do Đảng đề ra như thế nào trong giai đoạn 1954 - 1975? + thời giàn từ 1954 - 1960 + từ 1960 - 1975
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I.Choose the word (A, B, C or D) whose stress is different from the others. 1. A. behind B. happy C. sofa D. dinner 2. A. grandparents B. computer C. microwave D. beautiful 3. A. fireplace B. laptop C. tourist D. hotel 4. A. interesting B apartment C. dishwasher D. family 5. A. cupboard B. messy C. device D. bedroom II.Choose the word (A, B, C or D) whose underlined part is pronounced differently. 6. A. tables B. chopsticks C. pictures D. pillows 7. A. cupboards B. windows C. tourists D. posters 8. A. dishes B. vases C. plates D. fridges 9. A. toilets B. hotels C. laptops D. fireworks 10. A. televisions B. bookshelves C. wardrobes D. parents III.Choose the correct form of the words (A,B,C or D) to complete the sentences. 11. There is an electric ,a stove and a fridge in our kitchen. A. cooking B. cooker C. cook D. cooked 12. They are having lunch in their beautiful big room. A. dined B. dinner C. dine D. dining 13. He should clean his room.There are a lot of toys and clothes on the floor. A. messy B. mess C. messing D. messed 14. They look around their new apartment with lots of modern devices. A. interest B. interested C. interestingly D. interesting 15. Your cupboard is too old. Let’s a new one. A. buy B. bought C. buying D. to buy
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trình bày tất cả các dạng hệ tuần hoàn ở động vật mấy chế chuyên sinh ơi giúp e với ạ
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