Cho phân số: A=\frac{9}{n-5}A=\(\frac{9}{n-5}\)Có bao nhiêu số nguyên nn để AA là số...
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Cho phân số:
Có bao nhiêu số nguyên để là số nguyên?
K
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E
1 tháng 3 2021
Staying safe on foot and bike
Look out for yourself and your friends when out (1)________ foot and bike. Choose the (2) ________ routes you can quieter, slower roads, with pavements if you’re walking or (3) ________ if you’re going by bike.
It’s easy to get distracted by your phone or by friends, but you need to be (4)________ to traffic. Put your phone away and take your earphones (5)________ when crossing the road. Don’t trust that drivers (6)_______ spot you and be able to stop in time – many drivers go too fast and don’t (7) ________ enough attention, (8)________ anything you can do to protect yourself is a good thing.
1. a. on b. in c. by d. with
2. a. safe b. safer c. safest d. safely
3. a. zebra crossings b. cycle paths c. footpaths d. bumpy roads
4. a. risky b. warning c. serious d. alert
5. a. off b. over c. out d. down
6. a. must b. will c. could d. should
7. a. pay b. make c. turn d. take
8. a. but b. so c. though d. because
NM
1 tháng 3 2021
Look out for yourself and your friends when out (1) A. on foot and bike. Choose the (2) C. safest routes you can quieter, slower roads, with pavements if you’re walking or (3) B. cycle paths if you’re going by bike.
It’s easy to get distracted by your phone or by friends, but you need to be (4) D. alert to traffic. Put your phone away and take your earphones (5) C. out when crossing the road. Don’t trust that drivers (6) B. will spot you and be able to stop in time – many drivers go too fast and don’t (7) A. pay enough attention, (8) B. so anything you can do to protect yourself is a good thing
\(A=\frac{9}{\frac{n}{5}}=9\div\frac{n}{5}=\frac{45}{n}\)
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