\(\text{1/ (2x - 5) +17 =6}\\ 2x-5=6-17\\ 2x-5=-11\\ 2x=-11+5\\ x=-6:2\\ x=-3\)

\(2x-5=-11\Leftrightarrow x=-3\)

\(\text{2/ 10 - 2(4 - 3x) = - 4}\\ 2\left(4-3x\right)=10-\left(-4\right)\\ 2\left(4-3x\right)=14\\ 4-3x=14:2\\ 4-3x=7\\ 3x=4-7\\ x=-3:3\\ x=-1\)

-45 : 5 . ( -3 - 2x ) = 3

5 . ( -3 - 2x ) = ( -45 ) : 3

5 . ( -3 - 2x ) = -15

-3 - 2x = ( -15 ) : 5

-3 - 2x = -3

      2x = ( - 3 ) - ( -3 )

      2x = 0

        x = 0 : 2

        x = 0

=> 5.(-3-2x) = -45 : 3 = -15

=> -3-2x = -15 : 5 = -3

=> 2x = -3 - (-3) = 0

=> x = 0 : 2 = 0

Vậy x = 0

Tk mk nha

-45 : 5.( -3 - 2x) = 3

-9.(-3 - 2x) =3

-3 - 2x = -9 . 3

 -3-2x = - 27

 2x = -27 -3

 2x = -24

x = -24: 2

x= -12

-45 : 5 . ( -3 - 2x ) = 3

5 . ( -3 - 2x ) = -15

-3 - 2x = -3

2x = 0

x = 0 : 2

x = 0

<=> -9 . ( -3 -2x ) = 3

<=> 27 + 18x        = 3

<=>   18x              = 3 - 27

<=>   18x              = -24

<=>       x              = -24 : 18

<=>        x            = -4/3

cảm ơn nha

-45:5(-3-2x)=3

5(-3-2x)= -45:3

5(-3-2x)=-15

-3-2x= -15:5

-3-2x= -3

  2x= -3-(-3)

2x= 0

x= 0:2

x= 0

Vậy x= 0

-45:5(-3-2x) = 3

      5(-3-2x) = 3.(-45)

      5(-3-2x) = -135

         -3-2x  = (-135) : 5

        -3-2x   = -27

            2x   = (-27) + (-3)

           2x    = -30

             x    = (-30) : 2

            x    = -15

- 45 : 5 ( - 3 - 2x ) = 3

- 45 : ( - 15 ) - 5 . 2x = 3

3 - 5 . 2x  = 3

5 . 2x = 3 - 3

5 . 2x = 0

2x = 0 : 5

2x = 0

x = 0 : 2 

x = 0

1) 3x = 45 + 15 = 60

x = 60 : 3 = 20

2) 5x = 50 - 35 = 15

x = 15 : 5 = 3

3) (2x - 5) + 17 = 6

2x - 5 = 6 - 17

2x - 5 = -11

2x = -11 + 5

2x = -6

x = -6 : 2 = -3

4) 10 - 2(4 -3x) = -4

2(4 - 3x) = -4 - 10 = -14

4 - 3x = -14 : 2 = -7

3x = -7 - 4 = -18

x = -18 : 3 = -6

\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)

a/ => 2x - 4 = 2² = 4

=> 2x = 8

=> x = 4

b/ => 60 : 2x = 10

=> 2x = 6

=> x = 3

c/ => 5(2x - 3) = 25

=> 2x - 3 = 5

=> 2x = 8

=> x = 4

d/ => 3x - 6 = 3⁴ : 3 = 3³ = 27

=> 3x = 33

=> x = 11

\(5\left(7+48:x\right)=45\)

 \(\Leftrightarrow\left(7+48x\right)=9\)

\(\Leftrightarrow4x=2\)

\(\Leftrightarrow x=2\)

________________

\(5^2x-3.2.5^2=5^2.3\)

\(\Leftrightarrow5x^2-3-2.5^2=75\)

\(\Leftrightarrow5x^2-3-50=75\)

\(\Leftrightarrow5x^2-3=125\)

\(\Leftrightarrow5x^2=128\)

\(\Leftrightarrow x^2=\frac{128}{5}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\frac{128}{5}\\x=-\frac{128}{5}\end{cases}}\)

___________________

\(2+x:5=0\)

\(\Leftrightarrow x:5=-2\)

\(\Leftrightarrow x=-10\)

\(10+2x=16\)

\(\Leftrightarrow2x=6\)

\(\Leftrightarrow x=3\)

sai câu 3 rồi