a) 3571 - ( 1265 + x ) = 728 : 14
3571 - ( 1265 + x ) = 52
1265 + x = 3571 - 52
1265 + x = 3519
x = 3519 - 1265
x = 2254
b) ( 15 + 4x ) : 29 + 32 = 47
( 15 + 4x ) : 29 = 47 - 32
( 15 + 4x ) : 29 = 15
15 + 4x = 15 . 49
15 + 4x = 735
4x = 735 - 15
4x = 720
x = 180
a) 3571 - ( 1265 + x ) = 728 : 14
3571 - ( 1265 + x ) = 52
1265 + x = 3571 - 52
1265 + x = 3519
x = 3519 - 1265
x = 2254
a) 3571 - ( 1265 + x ) = 728 : 14
3571 - ( 1265 + x ) = 52
1265 + x = 3571 - 52
1265 + x = 3519
x = 3519 - 1265
x = 2254
b) ( 15 + 4x ) : 29 + 32 = 47
( 15 + 4x ) : 29 = 47 - 32
( 15 + 4x ) : 29 = 15
15 + 4x = 15 . 49
15 + 4x = 735
4x = 735 - 15
4x = 720
x = 180
b) ( 15 + 4x ) : 29 + 32 = 47
( 15 + 4x ) : 29 = 47 - 32
( 15 + 4x ) : 29 = 15
15 + 4x = 15 . 49
15 + 4x = 735
4x = 735 - 15
4x = 720
x = 180
Tìm số tự nhiên x biết :
a ) 3571 - ( 1265 + x ) = 728 : 14
3571 - ( 1265 + x ) = 52
1265 + x = 3571 - 52
1265 + x = 3519
x = 3519 - 1265
x = 2256
b ) ( 15 +4x ) : 29 + 32 = 47
( 15 + 4x ) : 29 = 47 - 32
( 15 + 4x ) : 29 = 15
15 + 4x = 15 . 29
15 + 4x = 435
4x = 435 - 15
4x = 420
x = 420 : 4
x = 105
c ) 50 + 144 ÷ ( x + 6 )2 = 54
thôi bn tự làm tiếp nhé!!!
@_@
a) 3571 - ( 1265 + x ) = 728 : 14
3571 - ( 1265 + x ) = 52
1265 + x = 3571 - 52
1265 + x = 3519
x = 3519 - 1265
x = 2254
Vậy x = 2254
b) ( 15 + 4x ) : 29 + 32 = 47
( 15 + 4x ) : 29 = 47 - 32
( 15 + 4x ) : 29 = 15
15 + 4x = 15 . 29
15 + 4x = 435
4x = 435 - 15
4x = 420
x = 420 : 4
x = 105
Vậy x = 105
c) 50 + 144 : ( x + 6 )2 = 54
144 : ( x + 6 )2 = 54 - 50
144 : ( x + 6 )2 = 4
( x + 6 )2 = 4 . 144
( x + 6 )2 = 576
( x + 6 )2 = 242 = (-24)2
\(\Rightarrow\orbr{\begin{cases}x+6=24\\x+6=-24\end{cases}\Rightarrow\orbr{\begin{cases}x=18\\x=-30\end{cases}}}\)
Vậy \(x\in\left\{-30;18\right\}\)
=))
a ) 3571 - (1265 + x) = 728 : 14
=> 3571 - (1265 + x) = 52
=> 1265 + x = 3519
=> x = 2254
~Study well~
#KSJ
