ngta dung mot may co cong suat 800W va hieu suat 85% de nang hang tu mat dat len 6m may da lm viec trong 10h. khoi luong hang ma may da nang dc la?

viet tat ca cac phan so bangvoi phan so -6/13 giai thich cach lam ok

Cho tam giác ABC có A(-1;3), đường cao BH có phương trình: x-y-2 = 0 CK là đường phân giác của góc C có phương trình: x+3y+4 = 0 Viết phương trình tổng quát của đường thẳng BC.

Lãnh thổ Việt Nam nằm trong múi giờ thứ mấy theo giờ GMT? A: 7. B: 6. C: 5. D: 8.

Vận động tạo núi nào sau đây khiến địa hình nước ta được nâng cao và phân thành nhiều bậc? A: Ca-lê-đô-ni. B: Hec-xi-ni. C: Hi-ma-lay-a D: In-đô-xi-ni.

Cho hai tập hợp : A={2;-3;5} và B={-3;6;-9;12} a, Có bao nhiêu tích a.b (Với a thuộc A ; b thuộc B) b, Có bao nhiêu tích lớn hơn 0, bao nhiêu tích nhỏ hơn 0 c, Có bao nhiêu tích là bội của 9 d, Có bao nhiêu tích là ước cả 12

Câu 6. Tìm GTNN của biểu thức : a) P = -│x + 1│ - 5 b) Q = -│x + 3│- │(y - 1) 2 |+ 2

đọc hiểu ạ Most of us tend to think of production when we think of mass media industries. After all, it is the output of this production – the papers we read, the cable TV shows we watch – that grab our attention, make us happy or angry, interested or bored. Moreover, most public discussion about mass communication tends to be about production. The latest gossip about that actor will be in what film, the angry comments a mayor makes about the violence on local TV news, the newest CDs by an up-and-coming group – these are the kinds of topics that focus our attention on the making of content, not its distribution or exhibition. Media executives know, however, that production is only one step in the arduous and risky process of getting a mass media idea to an audience. Distribution is the delivery of the produced material to the point where it will be shown to its intended audience. The activity takes place out of public view. We have already mentioned the NBC acts as a distributor when it disseminates television programming via satellite to TV stations. When Philadelphia Newspapers Inc. delivers its Philadelphia Inquirer to city newsstands, when Twentieth – Century – Fox moves its Musicland stores, they are involved in distribution to exhibitions. Question 1. In this passage, “arduous” means . A. difficult B. lucrative C. lengthy D. free Question 2. The passage states that people tend to focus on production because . A. it takes place out of public view B. mass media companies do not own production divisions C. the output of mass media is intended to grab our attention D. companies can function as both producers and distributors Question 3. In this passage, to “disseminate” means to __ . A. create B. send out C. take in D. fertilize Question 4. This passage states that distribution is . A. the first step in mass media production B. the most talked-about step in mass media production C. at least as important as production D. not as important as exhibition Question 5. The author’s purpose in writing this passage is to . A. tell an interesting story B. define a concept clearly C. describe a scene vividly D. argue with the reader

trên tia Am lấy hai điểm B,C sao cho AB =4cm,AC=4cm,AC=6cm. A.trong ba điểm A,B,C điểm nào nắm giữa hai điểm còn lại?vì sao

lm giúp mik câu 2, câu 3 phần tự luận vs ạ