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banhuyensky
2 năm trước
một con ốc sên ban ngày bò lên một cây cột được 5m,nhưng ban đêm lại tụt xuống 4m.hỏi,cây cột cao 45m thì ốc sên bò trong mấy ngày để lên đỉnh
Thích Trả lời Chia sẻ

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Câu 1:Cho tam giác ABC có AB=AC. Gọi M là trung điểm của BC. Trên cạnh AM lấy điểm K bất kì. Tia BK cắt cạnh AC tại F, tia CK cắt cạnh AB tại E. Khẳng định nào dưới đây là sai: A.tam giác ABM=tam giác ACM B.KB=KC C.EF//CB D.tam giác AEF=tam giác KEF Câu 2:Biết hai đại lượng x và y tỉ lệ nghịch với nhau và khi x=20 thì y=1/2. Tính giá trị của y khi x=5 A.2 B.10 C.15 D.1/5 Câu 3:Để giúp đỡ các bạn học sinh nghèo vượt khó trong học tập nhà trường đã phát động phong trào quyên góp sách cũ. Số sách của lớp 7A, 7B, 7C quyên góp lần lượt tỉ lệ với các số 5; 2; 4. Biết tổng số sách ba lớp góp được là 275 quyển. Khi đó số sách của lớp 7A quyên góp được là: A.75 B.25 C.100 D.125 Câu 4:Cho x và y là hai đại lượng tỉ lệ thuận. Biết khi x=-11 thì y=5. Hệ số tỉ lệ k của y đối với x là: A.5/11 B.-5/11 C.11/5 D.-11/5 Câu 5:Tổng tất cả các giá trị của x thỏa mãn |x-1|=|-8| là: A.9 B.-7 C.2 D.16 Câu 6:Cho P là chu vi một khu vườn hình chữ nhật biết rằng tỉ số giữa độ dài hai cạnh của nó bằng 3/4 và diện tích khu vườn bằng 108\ cm^2. Giá trị của P bằng: A.96 B.48 C.42 D.21 Câu 7:Cho tam giác ABC có AB<AC. Gọi M là trung điểm của BC. Trên tia đối của tia MA lấy điểm D sao cho MD=MA. Khẳng định nào sau đây là đúng: A. tam giác AMB=tam giác AMC B. tam giác BMA=tam giác BMD C. tam giác AMB=tam giác DMC D. tam giác AMC=tam giác DMC

Giúp mik vsssss Indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. 19. Ha Noi has crowded streets from morning until evening. A. large B. busy C. narrow D. small 20. The abbreviation DYLI means: A. do you look it B. doing you lot eyes C. Do you love it? D. discuss early Indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. 21. It is inconvenient to live far from the supermarket or the market. A. convenient B. convenience C. difficult D. annoying 22. This was a moving film. All the audiences cried. A. fast B. unemotional C. crying D. stopping Read the passage and decide which answer A, B, C or D best fits each space. Once upon (23)__________, in the land called Lac Viet, Lac Long Quan, the dragon king of the ocean, lived (24)__________ and sometimes turned to the land to help people fight against demons, (25)__________ them to grow rice and cut wood for building houses. Lac Long Quan (26)_________ Au Co – the daughter of Agriculture Saint. The couple lived in harmony in a palace. Later, Au Co gave birth to a one-hundred-egg bag, hatching to 100 sons. One day, Lac Long Quan felt that he couldn’t live (27)__________ the land all the time. He took 50 of their sons to settle down into the sea. The rest followed Au Co to go up to the mountain. 23. A. time B. a time C. the time D. times 24. A. on water B. on the water C. under water D. under the water 25. A. teach B. ask C. learn D. make 26. A. got married to B. married C. got married D. married to 27. A. at B. on C. in D. under Read the following text and write T / F for each statement. Spring is a time when there are many festivals in our country. Among them, Hoa Ban Festival is the most beautiful and interesting and it takes place in Lai Chau. It’s typical of the cultural life of the Thai people. In the second lunar month of the year, when it gets warmer and hoa Ban- a kind of beautiful flower in the northwest mountainous area- blossoms, Hoa Ban Festival is celebrated. This is a great time for everyone, especially for boys and girls. The boy gives the most beautiful flowers to his girlfriend. This is not only a time for love but also for the Thai people pray for good crops, for happiness, and express their special thanks to the Gods and ancestors. The festival is always full of songs and prayers. Write T / F for each statement. 28. Hoa Ban Festival is a typical of the cultural of the Thai. 29. Hoa Ban Festival is celebrated in the first lunar month. 30. The festival is a time for love. 31. The Thai pray for good crops, for happiness. 32. There are lots of fruit in the festival. II. WRITING: Choose the best answer that is the same meaning with the provided sentence 33. He broke my watch. A. My watch were broken. B. My watch be broken. C. My watch is broken. D. My watch was broken. 34. Mary is cutting a cake with a sharp knife. A. A cake is being cut with a sharp knife by Mary. B. A sharp knife is cutting a cake and Mary. C. Mary and a sharp knife are cutting a cake. D. Mary is cutting a sharp knife by a cake. 35. They speak much about this book. A. This book is much spoken about. B. This book is much spoken. C. This book is much about spoken. D. This book are much spoken about. 36. Which book do the students love? A. Which book are done love by the students? B. Which book is the students loved? C. Which book are loved by the students? D. Which book is loved by the students? Choose the best answer for the sentence by rearranging the words. 37. Yesterday/was/when/ he/carrying/a /suitcase/ he/ on/dropped/ it/ his/ foot. A. Yesterday when he dropped it on his foot, he was carrying a suitcase. B. Yesterday when he was carrying a suitcase, he dropped it on his foot. C. Yesterday when he was carrying it a suitcase, he dropped on his foot. D. Yesterday when he dropped a suitcase, he was carrying it on his foot. 38. He /painting/the/ on/ chair/ when/ I/ sat/ it/down/was/. A. He sat down on it when I was painting the chair. B. I sat down on the chair when He was painting it. C. He sat down on the chair when I was painting it. D. He was painting on the chair when I sat it down. mấy bạn làm đc câu nào thì làm làm hết thì càng tốt đang cần gấp ( 5vote + 1trais tim siu to nhé)

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