hai vòi cùng chay vào bể nước cạn thì sau 7h12p thì đầy nếu mở vòi thứ nhất trong 5h thi vòi thứ2 trong 6h thì được 3/4.hỏi nếu mỗi vòi chuayr một mình thì sau bao lâu mới đầy

Một lít dầu có khối lượng 800g . Có 1200N dầu sẽ đong đc bao nhiêu lít

Em hãy nêu các nguyên nhân chính dẫn đến các vụ tai nạn giao thông? Theo em, làm thế nào để tránh được tai nạn giao thông, bảo đảm an toàn khi đi đường? *

Giúp ạ Exercise 12. Mark the letter A, B, C or D to indicate the sentence that is closest in meaning to each of the following questions. 131. Why don't we get someone to fix our computer? A. Fixing our computer is someone else's duty. B. Let's have someone to fix our computer. C. Someone will have our computer fixed. D. Why don't we have our computer fixed? 132. My car needed servicing, so I took it to a garage. A. I took my car to a garage to have it serviced. B. I took my car, which needed to be servicing, to a garage. C. I had a garage get serviced my car. D. My car was taken to a garage to have it serviced. 133. Someone stole my dad's mobile phone last night. A. My dad had his mobile phone stolen last night. B. My dad got someone steal his mobile phone last night. C. My dad asked someone to steal his mobile phone last night. D. My dad was robbed of his mobile phone last night. 134. Someone is checking my car tyres for me. A. I'm getting my car tyres checked. B. I'm having my car tyres to be checked by someone. C. I have my car tyres checked regularly. D. My car tyres are being checked by myself. 135. Why don't you get someone to update the new computer program for me? A. I suggest that you update the new computer program for me. B. Shall I have the new computer program updated for you? C. Why don't you ask someone to update the new computer program for me? D. Why don't you have the new computer program updated by yourself? 136. We have decided to employ someone to put in a better lock. A. A better lock has been decided to be put in. B. We have decided to have a better lock put in. C. We have decided to put in a better lock. D. We have decided that we put in a better lock. 137. Jane recommended asking someone to mow the lawn. A. It is recommended by Jane that the lawn was mowed. B. Jane recommended getting the lawn mowed. C. Jane recommended mowing the lawn. D. Someone was recommended to be mowed the lawn. 138. The teacher had his students use their laptops to surf the Net for resources in his class. A. According to the teacher, the students had their resources surfed on their laptops. B. Laptops must be used to surf for resources by the students in the class. C. The teacher asked his students to use their laptops to surf the Net for resources in his class. D. With the laptops, the students could surf the Net for resources in class. 139. We cannot live in outer space without special equipment. A. It is impossible for us to live in outer space without special equipment. B. We are impossible to live outer space without special equipment. C. Without special equipment, we are very likely to live in outer space. D. But for special equipment, we couldn't have lived in outer space. 140. Had he known more about computer programming, my brother would have worked for a computer company. A. A better knowledge of computer programming will help my brother find a job in a computer company. B. My brother didn't know much about computer programming, so he didn't work for a computer company. C. My brother wishes he had known more about computer programming and could work for a computer company. D. Knowing more about computer programming, my brother would find a job in a computer company.

a)2.(x-5)-3.(x-4)=-6+15.(-3) b)(x+7).(x-9)=0 c)|2x-5|-7=22

Chọn từ phù hợp hoàn thành câu giúp em với ạ

cảm ơn người nha! 1 câu thôi bài 1 50 điểm

xác định thành phần biệt lập (gọi tên) và cho biết công dụng của chúng trong các câu sau a. Bầu ơi thương lấy bí cùng Tuy rằng khác giông nhưng chung một giàn b.Cô bé nhà bên(có ai ngờ) Cũng vào du kích Hôm gặp tôi vẫn cười khúc khích Mắt đen tròn(thương thương quá đi thôi) c.Móng Cái-quê tôi là nơi đặt nét bút đầu tiên trên bản đồ hình chữ S Việt Nam

Bài 2. Cho tam giác ABC vuông tại A , 2BCAB . D là trung điểm cạnh AC . Đường thẳng vuông góc với AC tại D cắt BC tại E . Chứng minh a) EACD cân. b) ABED đều.

cho hình thang cân ABCD ( AB > CD ) nội tiếp trong đường tròn (O). Tiếp tuyến với (O) tại A và D cắt nhau tại E. Gọi I là giao điểm của hai đường chép AC và BD. a, CMR: AEDI nội tiếp b, CMR: AB//EI