![](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)
5x+3 - 13 = 612
<=> 5x+3 = 625
<=> 5x+3 = 54
<=> x + 3 = 4
<=> x = 1
\(5^x+3-13=162\)
\(\Rightarrow5^x+3=162+13\)
\(\Rightarrow5^x+3=175\)
\(\Rightarrow5^x=175-3\)
\(\Rightarrow5^x=172\)
\(\Rightarrow x\in\varnothing\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ( x - 17 ) : 21 - 3 = 7
( x - 17 ) : 21 = 7 + 3
( x - 17 ) : 21 = 10
x - 17 = 10 x 21
x - 17 = 210
x = 210 + 17
x = 227
![](https://rs.olm.vn/images/avt/0.png?1311)
5x - 1 - 13 = 612
5x - 1 = 612 + 13
5x - 1 = 625
54 = 625
x = 4 + 1
x = 5
\(5^{x-1}-13=612\)
\(5^{x-1}=612+13\)
\(5^{x-1}=625\)
\(5^{x-1}=5^4\)
\(x-1=4\)
\(x=4+1\)
\(x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (2x - 5)3 = 27
(2x - 5)3 = 33
2x - 5 = 3
2x = 8
x = 4
b) 5x + 3 - 13 = 612
5x + 3 = 625
5x + 3 = 54
x + 3 = 4
x = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5^{x-1}-13=612\)
\(\Leftrightarrow5^{x-1}=625\)
\(\Leftrightarrow5^{x-1}=5^4\)
\(\Leftrightarrow x-1=4\)
\(\Leftrightarrow x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5x - 13 = 612
5x = 612 + 13
5x = 625
x = 625 : 5
x = 125
Vậy x = 125
5x-1-13=612
5x-1=612+13
5x-1=625
5x=625+1
5x=626
x=626:5
x=125,2
![](https://rs.olm.vn/images/avt/0.png?1311)
5x - 1 - 13 = 612
5x = 612 + 13 + 1
5x = 626
x = 4
thay x = 4
54 - 1 - 13 = 612
đúng !
5x+3 -13=612
5x+3 =612+13
5x+3 =625
5x+3 =54
=>x+3=4
x=4-3
x=1
5x+3-13=612
=> 5x+3=612+13
=> 5x+3=625
=> 5x+3=54
=> x+3=4
=> x=4-3
=> x=1