7x-x=5^21:5^19+3.2^2-7^0
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)
7x+x=521:519+3.22-70
=> 8x=52+3.4-1
=> 8x=36
=> x=36/8=9/2
Kết quả 9/2
học tốt
Ta có : 7.x + x = 521 : 519 + 3.22 - 70
<=> 8.x = 52 + 3.4 - 1
<=> 8.x = 25 + 12 - 1
<=> 8.x = 37 - 1
<=> 8.x = 36
<=> x = 9/2 = 4,5
Vậy x = 4,5
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(xemlai..7x-x...hay...7x^2-x\)
7x-x=6x
\(6x=\frac{5^{21}}{5^{19}}+3.2^2.7^0=5^{\left(21-19\right)}+3.4.1=5^2+12=37\)
6x=37=> x=37/6
![](https://rs.olm.vn/images/avt/0.png?1311)
7x-x = 521:519+3 . 22 - 70=52 + 3 . 4 - 1 = 25 + 3 . 4 - 1 = 25 + 12 - 1 = 36
7x - x = 6x = 36
x= 36 : 6 = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
7x-x =521: 519. 3.22-70
=>6x =521: 519+3.22-70
=> 6x = 52 + 3.4-1
=> 6x =25+3.2-1
=> 6x = 25+6-1
=> 6x = 30
=> x = 30:6
=> x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
a)9x-1=9
9x-1=91
x-1=1
x=2
Vây x=2
b)7x-x=521:519+3.22-70
6x=52+12-1
6x=25+11
6x=36
x=6
Vậy x=6
7x-x=521:519+3.22-70
=>x.(7-1)=53+3.4-1
=>6x=125+12-1
=>6x=136
=>x=68/3
7x - x = 521 : 519 + 3. 22 - 70
(7-1)x=52 + 3. 4 - 1
6x = 25 + 12 - 1
6x = 36
x = 6