a) 390 - (x - 7) = 169 : 13
390 - (x - 7) = 13
x - 7 = 390 - 13
x - 7 = 377
x = 377 + 7
x = 384
b) ( x - 140 ) : 7 = 32 - 23 . 3
(x - 140) : 7 = -15
x - 140 = -15 . 7
x - 140 = -105
x = 105 + 140
x = 35
a) 390 - (x - 7) = 169 : 13
390 - (x - 7) = 13
x - 7 = 390 - 13 = 377
x = 377 + 7
x = 384
\(390-\left(x-7\right)=169:13\)
\(\Rightarrow390-\left(x-7\right)=13\)
\(\Rightarrow x-7=390-13\)
\(\Rightarrow x-7=377\)
\(\Rightarrow x=384\)
a) 390 - (x-7) = 169 : 13
390 - (x-7) = 13
x-7= 377
x= 384
b) (x-140) : 7 = 3^2 - 2^3 *3
(x-140) : 7 = -15
x-140 = -105
x= 35
a) 390 - (x-7)= 169 : 13
390 -(x-7)= 13
x-7 = 390 -13
x-7 = 377
x=377 + 7 = 384
b) ( x-140) : 7 = \(3^2-2^3.3\)
(x - 140 ) : 7 = \(9-24\)
( x - 140 ) : 7 = -15
x- 140 = -15 . 7
x -140 = -105
x = -105 + 140
x = 35
a) 390 - ( x - 7 ) = 169 : 13
390 - x + 7 = 13
390 - x = 6
x = 384
b) ( x - 140 ) : 7 = 32 - 23 . 3
( x - 140 ) : 7 = 3(3 - 8)
( x - 140 ) : 7 = 3.(-5)
( x - 140 ) : 7 = -15
( x - 140 ) = -105
x = 35
a) 390 - ( x - 7 ) = 169 : 13
390 - ( x - 7 ) = 13
x - 7 = 390 - 13
x - 7 = 377
x = 377 + 7
x = 384
a, 390 - ( x -7 ) = 169 : 13
390 - ( x - 7 ) = 13
x - 7 = 390 - 13
x - 7 = 377
x = 377 + 7
x = 384
b, ( x - 140 ) : 7 = 32 - 23 . 3
( x - 140 ) : 7 = -15
( x - 140 ) = (-15) . 7
( x - 140 ) = -105
x = (-105) + 140
x = 35
Nhớ k đúng cho mình nha :)))))
a) 390 - ( x - 7 ) = 169 : 13
390 - ( x - 7 ) = 13
x - 7 = 390 - 13
x - 7 = 377
x = 377 + 7
x = 384
b) ( x - 140 ) : 7 = 32 - 23 . 3
( x - 140 ) : 7 = 9 - 8 .3
( x - 140 ) : 7 = 9 - 24
( x - 140 ) : 7 = -15
x - 140 = -15 x 7
x - 140 = -105
x = -105 + 140
x = 35
min
390- (x-7) = 169: 13
390- (x-7) = 13
<=>x-7=390-13
<=>x-7=377
<=>x=377+7
Vậy x=384