Đáp án:
bạn tự vẽ hình nha
xét Δ ABC
theo định lí pytago ta có: AB²+AC²=BC² ⇔ 6² + 8² = BC² ⇔ BC²=100 ⇔ BC²=√100 ⇔BC = 10(cm)
mk bt làm đến đó thôi
Giải thích các bước giải:
$ΔABC$
$AB²+AC²=BC²$
$⇔ 6² + 8² = BC²$
$⇔ BC²=100$
$⇔ BC²=√100$
$⇔BC = 10(cm)$
Lim (căn n^2 -4n )- (căn 4n^2+1)/căn (3n^2+1)-n
Vẽ sơ đồ tư duy về trình tự lập luận của văn bản " Đức tính giản dị của Bác Hồ" (Học từ tuần trước thế nhưng mik bỏ đấy và ko làm,hôm nay cô giáo bắt làm để gửi cho cô nên bạn nào chụp cho mik tham khảo cái.Mik cảm ơn trước và mik hứa sẽ vote 5 sao )
Bài 1:tìm và sửa lỗi sai trong câu bên dưới. 1.He would't drink this wine if i was him ->......……… 2.they'd go abroad in the winter if they don't have a young baby ->…………… 3.If his leg was broken,it would hurt more. ->…………… 4.Hoa would't have some money if she didn't work. ->…….......... 5.Wind'II have a look.If he would give it to her. ->................ Baì2:khoanh tròn câu trl đúng 1.....loss can becaused by noise pollution. A.Sound. B.Hearing. C.Listening. D.Audio 2.Ships spill oil on oneans and rivers.This leads to the......of many aquatic animals and plants. A.die. B.died. C.dead. D.dcath 3.Households pollute water sourcea by.......waste into ponds,lakes and rivers A.damaging. B.dumping. C.losing. D.lcading 4.This month's electricity bill is too high.......the air conditioner is tumed on all the time. A.since. B.duc to. C.although. D.because of 5.thegovemment has come.......a solution to the water problems of the city. A.up to. B.up with. C.to with. D.on to 6.All the aquatic plants and animals will die if the factory........dumping poison into the lake. A.will keep. B.to keep. C.kept. D.keeps 7.A lot of fish has died recently because of the .......water in this lake. A.contaminating. B.contaminated. C.contaminate. D.contaminant 8.If the air were clean,we........have to wear masks when going out. A.would't. B.won't. C.would. D.will 9.If I......you.I......water from that dirty tap. A.am-will drink. B.am-won't drink. C.were-would drink. D.were-wouldn't drink 10.If he..........trash around his garden,the ganlen would look very nice flow. A.will throw. B.would throw. C.didn't throw. D.doesn't throw
Bài giải sao ạ mọi người giải giùm em ạ có lời giải nha
Read the following passage and choose the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. The World Wild Fund for Nature (WWF) is an international non- governmental organization for the conservation, research and restoration of the environment, formerly named the World Wildlife Fund, which remains its official name in the United States and Canada. It is the world’s largest independent conservation organization with over 5 million supporters worldwide, working in more than 90 countries, approximately 9% of its funding coming from voluntarily donations by private individuals and businesses. The group says its mission is “to halt and reserve the destruction of our environment”. Currently, much of its work focuses on the conservation of three biomes that contain most of the world’s biodiversity: forests, freshwater, ecosystems, and oceans and coasts. Among other issues, it is concerned with endangered species, pollution and climate change. The organization runs more than 20 field projects worldwide in any given year. 36. The World Wild Fund for Nature (WWF) is concerned with ______ A. industry B. humanity C. atmosphere D. environment 37. WWF is now working in about ______ A. nineteen countries B. one hundred countries and territories C. ninety countries D. sixty- nine countries and states 38. Nine percent of WWF funding comes from ______ A. governments all over the world B. private individuals and businesses C. the United States D. Canada 39. The word “pollution” in passage is closest in meaning to ______ A. contamination B. habitat C. conservation D. protection 40. Which of the following statements is NOT true? A. WWF is a non- governmental organization B. Its name in the United States and Canada is different C. WWF focuses on conservation of forests D. WWF is also concerned with climate change
Hình ảnh nhân hóa " hạt cát khối tình con " trong đoạn trích có tác dụng gì??
Put the suitable preposition(s) in each of the following blanks. 11. Although Mark said that he’d be there at 8. 00, he didn’t turn ________ until 10. 30. 12. She takes ________ her father: she has the same gestures and mannerisms. 13. He said he would make me a rich man, but I saw ________ him immediately. 14. We’ve run ________ coffee. Could you go and buy some? 15. We put ________ a sum of money each month for our summer holidays. 16. He looks ________ his older brother and follows his example in everything. 17. She had to cancel her holiday when she went ________ the flu. 18. I don’t know if she’ll get ________ her husband’s death. 19. He was told to cut ________ sugar and fats or he would suffer serious health problems. 20. We don’t know yet how we’ll solve the problem but I’m sure someone will come ________ a solution soon.
Câu 3: Khi kéo 1 vật có khối lượng m=130kg để di chuyển đều trên sàn cần 1 lực F1 = 100N theo phương di chuyển của vật. Cho rằng lực cản chuyển động (Lực ma sát tỉ lệ với trọng lượng của vật). a. Tính lực cần để kéo 1 vật có khối lượng m2 = 500kg di chuyển đều trên sàn. b. Tính công của lực để vật m2 đi được 1 quãng đường S = 10m.
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