![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\Rightarrow\left(n+2\right)+3⋮\left(n+2\right)\)
\(\Rightarrow\left(n+2\right)\inƯ\left(3\right)=\left\{-3;-1;1;3\right\}\)
\(\Rightarrow n\in\left\{-5;-3;-1;1\right\}\)
b) \(\Rightarrow\left(n+1\right)+6⋮\left(n+1\right)\)
\(\Rightarrow\left(n+1\right)\inƯ\left(6\right)=\left\{-6;-3;-2;-1;1;2;3;6\right\}\)
\(\Rightarrow n\in\left\{-7;-4;-3;-2;0;1;2;5\right\}\)
c) \(\Rightarrow\left(n+1\right)^2-\left(n+1\right)+13⋮\left(n+1\right)\)
\(\Rightarrow\left(n+1\right)\inƯ\left(13\right)=\left\{-13;-1;1;13\right\}\)
\(\Rightarrow n\in\left\{-14;-2;0;12\right\}\)
d) \(\Rightarrow\left(n+2\right)^2-\left(n+2\right)+7⋮\left(n+2\right)\)
\(\Rightarrow\left(n+2\right)\inƯ\left(7\right)=\left\{-7;-1;1;7\right\}\)
\(\Rightarrow n\in\left\{-9;-3;-1;5\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 6:
a: Hai kí hiệu đó khác nhau
\(\in\) là kí hiệu thuộc
\(\subset\) là kí hiệu tập hợp con
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\) \(ƯCLN\left(a,b\right)=18\Rightarrow\left\{{}\begin{matrix}a=18m\\b=18n\end{matrix}\right.;\left(m,n\right)=1\)
Thay vào \(a+b=162\)
\(\Rightarrow18\left(m+n\right)=162\\ \Rightarrow m+n=9\)
Vì \(\left(m,n\right)=1\)
m | n | a | b |
1 | 8 | 18 | 144 |
2 | 7 | 36 | 126 |
4 | 5 | 72 | 90 |
5 | 4 | 90 | 72 |
7 | 2 | 126 | 36 |
8 | 1 | 144 | 18 |
Vậy \(\left(a;b\right)=\left\{\left(18;144\right);\left(36;126\right);\left(72;90\right);\left(90;72\right);\left(126;36\right)\left(144;18\right)\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,x+2010=2021\\ \Rightarrow x=2021-2010\\ \Rightarrow x=11\\ b,x^5=32\\ \Rightarrow x^5=2^5\\ \Rightarrow x=2\\ c,2^x=16\\ \Rightarrow2^x=2^4\\ \Rightarrow x=4\\ d,4.2^x-3=125\\ \Rightarrow4.2^x=128\\ \Rightarrow2^x=32\\ \Rightarrow2^x=2^5\\ \Rightarrow x=5\\ e,3^x+3^{x+1}=324\\ \Rightarrow3^x+3^x.3=324\\ \Rightarrow\left(1+3\right).3^x=324\\ \Rightarrow4.3^x=324\\ \Rightarrow3^x=81\\ \Rightarrow3^x=3^4\\ \Rightarrow x=4\)
a, <=> x= 11
b, <=> x5 =25
<=> x=2
c, <=> 2x =24
<=> x=4
d, 4.2x -3 =125
<=> 4.2x =128
<=> 2x = 32
<=>2x = 25
<=> x=5
e, <=> 3x +3x.3=324
<=> 4.3x =324
<=> 3x =81
<=> 3x =34
<=> x=4
Đ/S: C. Hai đường chéo bằng nhau
_HT_
C nhé cậu
chúc cậu học tốt!!!