123 - 5(x + 4) = 38

=> 5(x + 4) = 85

=> x + 4 = 17

=> x = 13

vậy_

(3x - 24).73 = 2.7

=> (3x - 24).73 = 14

=> 3x - 24 = 1022

=> 3x = 1046

=> x = 1046/3

3x = 2.7 + 16 = 30

x = 10

\(\left(3x-2^4\right)7^3=2\cdot7^4\)

\(3x-2^4=2\cdot7^4:7^3\)

\(3x-16=14\)

\(3x=30\)

\(x=10\)

ta co: (3×x-2^4)×7^3=2*7^4

3*x-16=2*7^4÷7^3

3*x-16=14

3*x=14+16

3*x=30

x=10

Ta có: 5².7³.11².x - 5².7².11⁴ = 0

=> 5².7².11²(7x - 11²) = 0

=> 7x - 121 = 0

=> 7x = 121

=> x = 121 : 7

=> x = 121/7

\(12,25-x+0,9=0,57\)

\(11,35-x=0,57\)

\(x=10,78\)

cậu làm rõ ràng hơn được ko? tớ ko hiểu cho lam

123 - 5(x + 4) = 38

=> 5(x + 4) = 85

=> x + 4 = 17

=> x = 13

vậy_

(3x - 2⁴).7³ = 2.7⁴

=> 3x - 16 = 2.7⁴ : 7³

=> 3x - 16 = 2.7

=> 3x - 16 = 14

=> 3x = 30

=> x = 10

vậy_

a)123 - 5 . ( x + 4 ) = 38

5 . ( x + 4 ) = 123 - 38

5 . ( x + 4 ) = 85

x + 4 = 85 : 5

x + 4 =17

x = 13

b) ( 3x - 2^4 ) . 7^3 = 2 . 7^4

( 3x - 2^4 )  = 2 . 7^4 : 7^3

( 3x - 2^4 )  = 2 . 7

 3x - 2^4   = 14

3x - 16 = 14

3x = 30

x = 30 : 3

x = 10   

123 - 5.(x+4) = 38

5.(x+4) = 85

x + 4 = 17

x= 13

(3x - 2^4_).7³ = 2.7⁴

3x - 2⁴ = 14 

3x = 30

x = 10

219 - 7(x + 1) = 10²

7(x + 1) = 219 - 10²

7(x + 1) = 219 - 100

7(x + 1) = 119

x + 1 = 119 : 7

x + 1 = 17

x = 17 - 1

x = 16

--------------------

(3x - 2⁴) . 7³ = 2.7⁴

(3x - 16).7³ = 2.7⁴

3x - 16 = 2.7⁴:7³

3x - 16 = 2.7

3x - 16 = 14

3x = 14 + 16

3x = 30

x = 30 : 3

x = 10

Lời giải:

$10+2x=4^5:4^3=4^2=16$

$2x=16-10=6$

$x=6:2=3$

---------

$2x-6^2:18=3.2^2$
$2x-2=12$

$2x=14$

$x=14:2=7$

--------------

$70-5(x-3)=3.2^5=96$

$5(x-3)=70-3.2^5=-26$

$x-3=\frac{-26}{5}$

$x=3+\frac{-26}{5}=\frac{-11}{5}$

------------------

$19-7(x+1)=10^2=100$

$7(x+1)=19-100=-81$

$x+1=\frac{-81}{7}$

$x=\frac{-81}{7}-1=\frac{-88}{7}$

------------

$(3x-2^4).7^3=2.7^4$

$3x-16=2.7^4:7^3=2.7=14$

$3x=14+16=30$

$x=30:3=10$

3x-2⁴=2.7²⁰²²:7²⁰²¹

3x-2⁴=2.7¹

3x=14+16

3x=30

x=10

vậy x=10