Đáp án:
a) $5$
b) $(x;y)=(2;2)$
c) $m=±\sqrt{2020}$
Giải thích các bước giải:
Tham khảo hình sau:
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Rút gọn biểu thức : √16a^2 + 4a ( a<0 ) Mong mn giúp đỡ ạ
VII. Rewrite the following 1. Although he wasn’t experienced, he got the job. Despite….. 2. Marco told me not to forget my tennis racket. Marco said….. 3. “Did you remeber to lock the door?” my father asked me. My father asked me….. 4. They learn English all over the world. English….. 5. He wrote stories and articles for newspapers. He wrote not…… VII. Rewrite the following 1. The mechanic checked the tyres on my car. (HAD) The mechanic….. 2. You’d better not touch that switch. (WOULDN’T) If….. 3. We spent three hours painting that door. (US) It took….. 4. You’ll be ill if you continue to smoke. (STOP) Unless….. 5. I regret saying that to him. (WISH) I….. VIII. Complete the letter Dear Julia, 1. I/ sorry/ it take/ so long/ reply/ letter. 2. I/ just/ come back/ trip/ the north/ country. 3. You/ be pleased/ know/ I come/ London/ next weekend. 4. It seem/ long time/ since/ we last /see/ other 5. I/ like/ meet you/ and / go out/ together. 6. I wonder/ you like/ go/ see/ film/ play. 7. There/ be/ new Harrison Ford film/ New Century cinema. 8. Perhaps/ can go/ meal/ drink/ afterwards. 9. Give/ ring later/ week/ arrange/ more definite 10. I/ look forward/ hear/ you soon. Love, Mary
V. Fill in a word When we (..1..) foreign countries, we see and learn all sorts of things that we can never see (..2..) learn at home, though we may read about (..3..) in books and magazines, and see pictures of them at the cinema. The best way to learn geography is to travel, (..4..) the best way to get to know and understand the people in (..5..) countries is to meet them in their (..6..) homes. Most people on visits (..7..) other countries take a (..8..) with them and photograph anything they are (..9..) in. Those photographs will remind them of the happy time (..10..) had on a visit to a foreign country. VI. Read and answer An artist went to a beautiful part of the country for a holiday, and satyed with a farmer. Every day he went out with his paints and his brushes and painted from morning to evening, and then when it got dark, he went back to the farm and had a good dinner before going to bed. At the end of his holiday, he wanted to pay the farmer, but the farmer said, “No, I do not want money, but give me one of your pictures. What is money? In a week it will all be finished, but your painting will be still be here.” The artist was very pleased and thanked the farmer for saying such kind things about the paintings. The farmer smiled and answered, “It is not that. I have a son in London. He wants to become an artist. When he comes here next month, I will show him your picture, and then he will not want to be an artist any more, I think.” 1. Where did the artist spend his holiday? 2. What did he do during his holiday? 3. What did the farmer ask the artist for at the end of the holiday? 4. Why was the artist very pleased with the farmer’s request? 5. Did the farmer’s son want to become an artist any more after he had seen the artist’s picture?
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Many people think of computers as very modern inventions, products of our new technological age. But actually the idea for a computer (1…)worked out over two centuries ago by a man (2…) Charles Babbage. Babbage was born (3…) 1791 and grew up to be a brilliant mathematician. He drew up plans for several calculating machines (4…) he called “engines”. But despite the fact that he (5…) building some of these he never finished any of them. Over the years people have argued (6…) his machines would ever work. Recently, however, the Science Museum in London has finished building (7…) engine based on one of Babbage’s designs. (8…) has taken six years to complete and more (9…) four thousand parts have been special exhibition in the Science Museum (10…) remind people of Babbage’s work. 1. A. has B. was C. had D. is 2. A. known B. recognized C. written D. called 3. A. in B. on C. by D. for 4. A. whose B. who C. these D. which 5. A. wanted B. made C. started D. missed 6. A. until B. whether C. while D. though 7. A. some B. the C. an D. that 8. A. One B. He C. It D. They 9. A. than B. therefore C. when D. then 10. A. as B. to C. for D. so
Giúp mình giải hết phần này nha Ai trả lời đúng và chính xác nhất sẽ đc 5s+cảm ơn+ctlhn ạ
1.Năm nay tuổi anh gấp rưỡi tuổi em. Từ khi tuổi anh bằng tuổi em hiện nay đến khi tuổi em bằng tuổi anh hiện nay là 10 năm. Tính tuổi mỗi người . 2.Cách đây 4 năm tuổi bố gấp 7 lần tuổi con. 6 năm nữa tuổi con = 1/2 tuổi bố cách đây 4 năm. Tính tuổi mỗi người.
làm nhanh nha 9h mình cần rồi xin lỗi vì tg gấp
vẽ chị Nanno trong phim cô gái đến từ hư vô ( lưu ý : có màu hoặc ko màu đều đc , những vẽ thế nào để mình đặt hình nền nha , anime )
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