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a,(6400+2600)-3x=1200
9000-3x=1200
3x=9000-1200
3x=7800
x=7800:3
x=2600
b,(4x-[(8000-3567)-(2031-1598)]=400
(4x-[4433-433]=400
4x-4000=400
4x=400+4000
4x=4400
x=4400:4
x=1100
C;2448:[(119-(x-6)]=24
119-(x-6)=2448:24
119-(x-6)=102
x-6=119-102
x-6=17
x=17+6
x=23
a. (6400+2600) -3x=1200
=> 9000-3x=1200
=> 3x=9000-1200
=> 3x=7800
=> x=7800:3
=> x=2600
b. {4x-[(8000-3567)-(2031-1598)]}=400
=> { 4x-(4433-433)}=400
=> 4x-4000=400
=> 4x=400+4000
=> 4x=4400
=> x=4400:4
=> x=1100
c. 2448:[(119-(x-6)]=24
=> 119-(x-6)=2448:24
=> 119-(x-6)=102
=> x-6=119-102
=> x-6=17
=> x=17+6
=> x=23
4x-(4233-433)=400
4x-3800=400
4x=400+3800
4x=4200
x=4200:4
x=1050
Mình không chép lại đề nha
a)119-(x-6)=102
x-6 =17
x =23
b)(6x-39):7=3
6x-39 =21
6x =60
x =10
c, d bạn tự làm nha
15) 70 - 5 . ( x - 3 ) = 45
5 . ( x - 3 ) = 70 - 45
5 . ( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
14 ) x : ( 1001 : 13 ) = 29
x : 77 = 29
x = 29 . 77
x = 2233
13 ) 420 : ( x : 39 ) = 105
x : 39 = 420 : 105
x : 39 = 4
x = 4 . 39
x = 156
a.\(7:\left|x-3\right|=4\)
\(\Leftrightarrow\left|x-3\right|=\frac{7}{4}\Leftrightarrow\orbr{\begin{cases}x-3=\frac{7}{4}\\x-3=\frac{-7}{4}\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{7}{4}+3\\x=\frac{-7}{4}+3\end{cases}}}\Leftrightarrow\orbr{\begin{cases}x=\frac{19}{4}\\x=\frac{5}{4}\end{cases}}\)
Vậy x = 19/4 hoặc x = 5/4
b. \(12:\left(x-8\right)=114\)
\(x-8=\frac{12}{114}=\frac{2}{19}\)
\(x=\frac{2}{19}+8\)
\(x=\frac{154}{19}\)
c. \(47+\left|x-7\right|=123\)
\(\Leftrightarrow\left|x-7\right|=123-47\Leftrightarrow\left|x-7\right|=76\)
\(\Leftrightarrow\orbr{\begin{cases}x-7=76\\x-7=-76\end{cases}\Leftrightarrow\orbr{\begin{cases}x=83\\x=-69\end{cases}}}\)
Vậy x = 83 hoặc x = -69
d.\(188+\left|3x-1\right|=1198\)
\(\Leftrightarrow\left|3x-1\right|=1198-188\Leftrightarrow\left|3x-1\right|=1010\)
\(\Leftrightarrow\orbr{\begin{cases}3x-1=1010\\3x-1=-1010\end{cases}\Leftrightarrow\orbr{\begin{cases}3x=1010+1\\3x=-1010+1\end{cases}\Leftrightarrow}\orbr{\begin{cases}3x=1011\\3x=-1009\end{cases}}}\Leftrightarrow\orbr{\begin{cases}x=337\\x=\frac{-1009}{3}\end{cases}}\)
Vậy x = 337 hoặc x= -1009/3
f ) [ ( 6x - 39 ) : 7 ] . 4 = 12
( 6x - 39 ) : 7 = 12 : 4
( 6x - 39 ) : 7 = 3
6x - 39 = 3 . 7
6x - 39 = 21
6x = 21 + 39
6x = 60
x = 60 : 6
x = 10
g ) 4x - [ ( 8000 - 3567 ) - ( 2031 - 1598 ) ] = 400
4x - [ 4433 - 433 ] = 400
4x - 4000 = 400
4x = 400 + 4000
4x = 4400
x = 4400 : 4
x = 1100
h ) 2448 : [ 119 - ( x - 6 ) ] = 24
119 - ( x - 6 ) = 2448 : 24
119 - ( x - 6 ) = 102
x - 6 = 119 - 102
x - 6 = 17
x = 17 + 6
x = 23
[ (6x-39):7].4=12
[ (6x-39):7]=12:4
[ (6x-39):7]=3
6x-39=3.7
6x-39=21
6x=21+39
6x=60