![](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,11-(15+21)=x-(25-9)
11-15-21=x-25+9
-x=-25+9-11+15+21
-x=9
x=-9
b,9-25=(7-x)-(25+7)
-16=7-x-32
x=7-32+16
x=-9
![](https://rs.olm.vn/images/avt/0.png?1311)
9 -25 = (7-x) - ( 25 +7)
- 16 = 7 -x - 32
x = 7 -32 +16
x =7 -16
x = - 9
![](https://rs.olm.vn/images/avt/0.png?1311)
9 - 25 = (7 - x) - ( 25 + 7)
-16 = 7 - x - 32
-16 = -25 - x
x = -25 - (-16)
x = -25 + 16
x = -9
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải
9 – 25 = ( 7 – x ) – ( 25+7)
9 +( -25) = 7 – x – 25 – 7
-16 = 7 – x – 25 – 7
x = 7 – 7 – 25 +16
x = - 25 + 16
x = -9
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )
11-15-11=x-25+9
-15=x-16
x=1
b, 2 - x = 17 - ( - 5 )
2-x=22
x=-20
c, x - 12 = ( - 9 ) - 15
x-12=-24
x=-12
d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )
(7-x)-32=-16
7-x=16
x=-9
#H
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp án là D
34 - (25 + 34) = x - (25 - 9)
34 - 25 - 34 = x - 16
34 - 34 - 25 = x - 16
-25 = x - 16
-25 + 16 = x
-(25 - 16) = x
-9 = x
![](https://rs.olm.vn/images/avt/0.png?1311)
9 – 25 = (7-x) – (25 + 7)
9 + (-25) = 7 – x – 25 – 7
-16 = 7 – x – 25 – 7
X = 7 – 7 – 25 + 16
x = -25 + 16
x = -9
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x= -15+16
x=1
vậy x=1
tick nha !!!!!!!
Ta co :
11-(15+11)=x-(25-9)
-15=x-(25-9)
-15=x-16
x=-15+16
x=1
lik e nhe
Ta có: \(25-\left(x+3\right)^2=9\)
=>\(\left(x+3\right)^2=25-9=16\)
=>\(\left[{}\begin{matrix}x+3=4\\x+3=-4\end{matrix}\right.\)
=>\(\left[{}\begin{matrix}x=4-3=1\\x=-4-3=-7\end{matrix}\right.\)
25 - (x + 3)2 = 9
(x + 3)2 = 25 - 9
(x + 3)2 = 16
Hay (x + 3)2 = 42
⇒x + 3 = 4
⇒x = 1 ϵ Z
Vậy x = 1