Đáp án+Giải thích các bước giải:
`(-1)/5.(2)=(-2)/7.(7)/5` Do `1(2/5)=7/5`
`⇔ (-2)/5=(-2)/5`
`⇔ 1=1`
Ta có các tỉ lệ thức sau: `4/8=1/2;8/24=1/3;5/30=10/60;...`
`-1/5*2=-2/7*1 2/5`
`=>-2/5=-2/7*7/5`
`=>-2/5=-2/5`
Tỉ lệ thức:
`1/4=2/8=3/12=4/16=5/20=.........`
Viết câu lệnh để vẽ hình lục giác đều có cạnh là 50 bước
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GIÚP MÌNH VỚI . BẠN NÀO NHANH MÌNH SẼ CHO CÂU TRẢ LỜI HAY NHẤT . CẢM ƠN NHIỀU
hai xe oto khởi hành cùng một lúc từ 2 địa điểm A và B ,cùng chuyển động đều về địa điêm C , biết AC =120km ; BC =90km. Xe khởi hành từ A đi vần tốc 50km/h . Muốn 2 xe đến điểm C cùng một lúc , xe khởi hành từ B phải chuyển động với vận tốc v2 bằng bao nhiêu ?
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Tiếp nè, ai giúp mình vớiiii Cb điền cả đáp án phía sau cho mình vớiiiii 1. Look this document ________carefully before you sign it. A.up B. on C. at D. over 2. If you don’t know what a word means, look it _____ in the dictionary. A. over B. up C. on D. at 3. I couldn’t make ______ all the words on the sign because my glasses were dirty. A.up B. out C. clear D. up with 4. Tony and Nancy always kiss and make ______after their arguments. A. up B. off C. with D. up with 5. Cross _____ my name because I won’t be able to attend. A. out B. down C. up D. away 6. She will cut ____ the number of cigrarettes she smokes. A. off B. in C. up D. down 7. Have you figured _______ how to solve the problem yet? A. out B. on C. in D. of 8. After you fill the application form______, sign it and date it. A. on B. off C. out D. with 9. You should always fill _______ your tank when it gets down to a quarter full. A. off B. up C. in D. out 10. All students must hand _____ their homework the day after it is assigned. A. out B. on C. to D. in
B. Choose the one word or phrase - a, b, c or d - that best completes the sentences. 1. The two children tried _________they could to bring about a reconciliation between their parents. a. more hard b. so hard as c. as hard as d. harder than 2. Gilbert Stuart is considered by most art critics_________ portrait painter in the North American colonies. a. the greatest b. as greatest c. greatest d. was the greatest 3. The United States has _________ Japan. a. twice people more than b. twice as many people as c. as many twice people as d. as many people as twice 4. The more we learn, _________. a. we become more wise b. we become wiser c. the more wise we become d. the wiser we become 5. Try to do this exercise. It is _________than the others. a. least difficult b. more and more difficult c. less difficult d. less and less difficult 6. James is _________person in the whole office. a. the most lazy and annoying b. more lazy and annoying than c. the most annoying and the laziest d. the laziest and most annoying 7. The more he tried to help her, _________ she seemed to appreciate it. a. the lesser b. less and less c. the least d. the less 8. The curriculum at the public school is as good _________of any private school. a. or better than b. as or better than that c. as or better that d. as and better than those 9. She practices playing the piano _________than I do. a. far more regularly b. much more regular c. very more regularly d. so more regularly 10. Because he was afraid, he walked__________. a. fast and fast b. faster and faster c. more and more fast d. fast and faster D. Complete the second sentences with double comparatives (the more/ less/ -er ... the more/ less/ -er). 1. The crowd became increasingly angry at the long delay. _________the delay (was), _________the crowd became. 2. The value of a picture depends on how famous the artist is. _________an artist (is), _________the picture is. 3. How well I sleep depends on how late I go to bed. _________I go to bed, _________I sleep. 4. I don’t spend much time with my family because I work so hard. _________I work, _________I spend with my family. 5. The traffic moves very slowly as more cars come into the city. _________cars come into the city, _________the traffic moves, 6 How much you sweat depends on how hot you get. _________you get, __________ you sweat. 7. It’s hard to concentrate when you are tired. _________you are, __________it is to concentrate. 8. How much petrol a car uses depends on how big the engine is, _________the engine (is), _________a car uses. 9. If a knife is sharp, it is easy to cut something with. _________a knife (is), _________it is to cut something. 10. I became increasingly nervous about her fast driving. _________she drove, _________I became.
Dùng ( / ) tách các từ trong đoạn văn sau : Mùa xuân đã đến
Giúp em vs ạ 1+ 2 + 3+ .....+ 19
câu 1: khi tiến hành phòng trù sâu, bệnh hại phải đảm bảo những nguyên tắc nào? nêu ưu, nhược điểm của phương pháp thủ công, hóa học, sinh học trong phòng trừ sâu, bệnh hại cây trồng câu 2: khi về quê thăm ông bà, Lan thấy Bác Năm đang phun thuốc trừ sâu, bệnh mà không mặc đồ bảo hộ lao động và đi ngược hướng gió. nếu trong trường hợp của bạn Lan, em sẽ làm như thế nào?
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