\(A=\frac{9}{\frac{n}{5}}=9\div\frac{n}{5}=\frac{45}{n}\)

Ta có : \(Ư\left(45\right)=\left\{\pm1;\pm3;\pm5;\pm9;\pm15;\pm45\right\}\)

Số số nguyên n để A là số nguyên là : 6 * 2 = 12 ( số )

Đ/s : 12 số

toa ko pt giải         nhơ kiểu cô cho sai đề

ờ như kiểu sai đề í. giống kiểu đéo j í. chẳng hỉu

40% NHA BẠN

nà ní khó thế

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nhanh nhé

Kết quả là 166,5

Diện tích một mặt của hình lập phương đó là:

294 : 6 = 49 (cm²)

Mà 49 = 7 x 7 nên cạnh của hình lập phương là 7 cm

Diện tích xung quanh của hình lập phương đó là:

49 x 4 = 196 ( cm²)

Thể tích hình lập phương đó là:

7 x 7 x 7 = 343 (cm³)

       Đáp số: Sxq= 196 cm² 

                    Stp= 343 cm³

diện tích xung quanh của hình lập phương là : 

           294 : 6 *4  = 196 ( m2 ) 

diện tích một mặt là : 

294 : 6 = 49 ( m2 ) 

mà : S một mặt = a*a nên cạnh hình lập phương là 7 m 

thể tích hình lập phương là :

           7*7*7 = 343 ( m3 ) 

                   Đ/s 

nhớ k cho mình nha 

Exercise 1: Put the verbs in the brackets in the correct tense 1. If I had a typewriter, I ............would type.............(type) it myself. 2. If I ............knew.............(know) his address, I'd give it to you. 3 .He ............would look.............(look) a lot better if he shaved more often. 4. If you .............played............(play) for lower stakes, you wouldn't lose so much. 5. If he worked more slowly, he .........wouldn't make................(not make) so many mistakes. 6. I shouldn't drink that wine if I ...........were..............(be) you. 7. More tourists would come to this country if it ............had.............(have) a better climate. 8. If I were sent to prison, would you .............visit............(visit) me? 9. If someone ..........gave...............(give) you a helicopter, what would you do with it? 10. I ...............would buy..........(buy) shares in that company if I had some money. Exercise 2: Using the given information, make conditional sentences with IF 1. They are poor, so they can’t help us. → If they .............................weren't poor, they could help us...................................................................... 2. He doesn’t do his homework. He is always punished. → If he ..................................did his homework, he wouldn't be always punished...................................................................

3. He doesn’t have enough time. He can’t help me. → If he .........................................had enough time, he could help us............................................................. 4. She doesn’t take any exercise, so she is overweight. → If she ........................................took some exercises. she wouldn't be overweight............................................................ 5. He doesn’t have a bicycle, so he always goes to class late. → He wouldn’t ........................................go to class late if he had a bicycle................................................... 6. I am bad at English, so I can’t do homework. → I could .........................................do homework if i were bad at english.......................................................... 7. He doesn’t practise speaking French, so he doesn’t speak it fluently. → If he .............................................practised speaking english french, he would speak it fluetly.......................................................... 8. The meeting can be cancelled because it snows heavily. → If it ......................................didn't snow heavily, the meeting couldn't be cancelled............................................................... 9. We don’t go because it will rain. → If it ..................................didn't rain, we would go ...................................................................... 10. John is fat because he eats so many chips. → If John .......................................didn't eat so any chips, he wouldn't be fat...........................................................

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Gọi tọa độ điểm $M$, $N$ lần lượt là $M\left(x_1;y_1\right),N\left(x_2;y_2\right)$.

Hệ số góc tiếp tuyến của $\left(C\right)$ tại $M$ và $N$ lần lượt là

$k_1=y^{\prime }\left(x_1\right)=-3{x_1}^2+6x_1-1$; $k_2=y^{\prime }\left(x_2\right)=-3{{}^{}}^{}$