Cho b=n+2/n-2 tim n de b là phan so
Cho A=n+3/n+2 voi n€z
a)tim dieu kien cua so nguyen n de A la phan so
b)tinh gia tri cua phan so A khi n=1;n=-1
c)tim so nguyen n de phan so A co gia tri la so nguyen
Cho bieu thuc A=6/n+2(n€Z)
a)Tim n de A la phan so
b)Tim n de A la so nguyen
a,A là phân số<=>n+2 \(\ne\) 0<=>n \(\ne\) -2
b, để A là p/s thì 6 chia het cho n+2
=>n+2 E Ư(6)={-6;-3;-2;-1;1;2;3;6}
=>n E {-8;-5;-4;-3;-1;0;1;4}
Nhớ tick
cho phan so n+8/n-7 voi n thuoc N , n>7
A,tim n de phan so co gia tri guyen
B,tim n de phan so toi gian
Bạn chờ tí, mình làm rồi nhưng nó chưa hiện lên ...
A,để n+8/n-7 nguyên thì n+8 chia hết chon-7=>n+8-(n-7) chia hết cho n-7=>15 chia hết cho n-7=>n-7 thuộc Ư(15)={+1;+3;+5;+15}
ta có bảng g trị
n-7 -15 -5 -3 -1 1 3 5 15
n -8 2 4 6 8 10 12 22
mk chỉ làm đc vậy thôi tích đúng cho mk nhé
Cho phan so A= n-2/n+3
Tim n de
a) a la phan so
b) A thuoc Z
a: Để A là phân số thì n+3<>0
hay n<>-3
b: Để A là số nguyên thì \(n-2⋮n+3\)
\(\Leftrightarrow n+3\inƯ\left(-5\right)\)
\(\Leftrightarrow n+3\in\left\{1;-1;5;-5\right\}\)
hay \(n\in\left\{-2;-4;2;-8\right\}\)
Cho phan so A= n-2/n+3
Tim n de
a) a la phan so
b) A thuoc Z
a) Để A là phân số \(\Leftrightarrow n+3\ne0\Leftrightarrow n\ne-3\)
b) \(A=\frac{n-2}{n+3}=\frac{\left(n+3\right)-5}{n+3}=1-\frac{5}{n+3}\)
để A nguyên thì \(n+3\inƯ\left(5\right)\)
Mà: Ư(5)={1;-1;5;-5}
Ta có bảng sau:
n+3 | 1 | -1 | 5 | -5 |
n | -2 | -4 | 2 | -8 |
Vậy n={-8;-4;-2;2}
a) Để A là phân số thì \(n+3\ne0\Leftrightarrow n\ne-3\)
b) Ta có:
\(A=\frac{n-2}{n+3}=\frac{n+3-5}{n+3}=\frac{n+3}{n+3}-\frac{5}{n+3}=1-\frac{5}{n+3}\)
Để \(A\in Z\Leftrightarrow\frac{5}{n+3}\in Z\)
\(\Rightarrow n+3\inƯ\left(5\right)\)
\(\Rightarrow n+3\in\left\{1;-1;5;-5\right\}\)
\(\Rightarrow n\in\left\{-2;-4;2;-8\right\}\)
Vậy \(n\in\left\{-2;-4;2;-8\right\}\)
cho A=n+3\n-2 (n thuoc Z)
a) tim n de A la phan so
b) tim n de A thuoc Z
c) tim n biet A=-4
bai 1:tim so nguyen x sao cho gia cua cac phan so la so nguyen
a)x+3/x-2
b)x2+3x-2/x+2
chu y:dau / la dau chia trong phan so
bai 2:cho A=2n+1/n-2 voi n la so nguyen
a)tim n de a la phan so
b)tim n de A nguyen
c)tinh gia tri cua A biet:n=2;1;-2;-1
giup minh voi minh dang can.Ai dung minh tick cho
Cho phan so: P = \(\frac{2n+7}{5n+2}\)(n thuoc Z)
a)Tim n thuoc z de P la phan so chua toi gian.
b)Tim n thuoc Z sao cho P la phan so toi gian.
cho bieu thuc a=2n+2/2n-4 (N thuoc Z)
a) voi gia tri nao cua n de a la phan so
b) tim cac so co gia tri cua n de là so nhuyen
2n+2 phan 2n-4
Hoàn tất đoạn văn sau, sau đó trả lời câu hỏi bên dưới
Quang s camping(1)_______at_____the weekend, he often go camping(2)_____on_____the mountains. He usually goes(3)____with______ his friend. Quang and his fried always wear strong boots(4)_____and______warm clothes. (5)______They_____always take food, water and a camping stove. Sometimes, they (6)______camp_______overnight.
* Questions:
1. What does Quang s?
He s camping.
2. Where does he often go camping?
He often goes camping on the mountains.
3. When does he go?
On weekend.
4. Who does he usually go with?
He usually goes with his friend.
5. What do they always wear?
Quang and his fried always wear strong boots and warm clothes.
6. What do they always take?
They always take food, water and a camping stove.
7. Do they camp overnight?
Yes, they do.