a) 25 : x = x

25 = x^2

x^2 = ( +-5 )^2

b) 3358 : 23 = 2x - 6

146 = 2x - 6

2x = 152

x = 76

c) ( 2x + 1 )^3 = 27 = 3^3

=> 2x + 1 = 3

=> 2x = 2

=> x = 1

d) ( x - 2 )^3 = ( x - 2 )^2

( x - 2 )^2 . ( x - 2 ) - ( x -2 )^2 = 0

( x - 2 )^2 . [ ( x - 2 ) - 1 ] = 0

+) x - 2 = 0

=> x = 2

+) x - 2 - 1 = 0

x - 3 = 0

x = 3

\(25\div x=x\Rightarrow x.x=25\Rightarrow x^2=25\Rightarrow\orbr{\begin{cases}x=5\\x=-5\end{cases}}\)

\(3358\div23=2x-6\)

\(\Rightarrow2x-6=146\)

\(\Rightarrow2x=152\)

\(\Rightarrow x=\frac{152}{2}=76\)

\(\left(2x+1\right)^3=27\)

Mà \(3^3=27\)

Nên \(\left(2x+1\right)^3=3^3\)

\(\Rightarrow2x+1=3\Rightarrow2x=2\Rightarrow x=1\)

\(\left(x-2\right)^3=\left(x-2\right)^2\)

\(\Rightarrow\left(x-2\right)^3-\left(x-2\right)^2=0\)

\(\Rightarrow\left(x-2\right)^2.\left(x-2-1\right)=0\)

\(\Rightarrow\left(x-2\right)^2.\left(x-3\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}}\)

Vậy......................

\(25:x=x\)

\(x^2=25\Leftrightarrow\orbr{\begin{cases}x=5\\x=-5\end{cases}}\)

\(3358:23=2x-6\)

\(\Leftrightarrow2x-6=146\)

\(\Leftrightarrow2x=152\)

\(\Leftrightarrow x=76\)

\(\left(2x+1\right)^3=27\)

\(\Leftrightarrow\left(2x+1\right)^3=3^3\)

\(\Leftrightarrow2x+1=3\)

\(\Leftrightarrow2x=2\)

\(\Leftrightarrow x=1\)

\(\left(x-2\right)^3=\left(x-2\right)^2\)

\(\Rightarrow\left(x-2\right)^3-\left(x-2\right)^2=0\)

\(\Leftrightarrow\left(x-2\right)^2.\left(x-2-1\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}\left(x-2\right)^2=0\\x-2-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=2\\x=3\end{cases}}}\)

-16 + 23 + x = -16

          7 + x = -16 

               x = -16 - 7

               x = -23

2x + 35 = -15

        2x = -15 - 35

         2x = -50

           x = -25

-13 x |x | = -26

         x = -26 : (-13)

          x = 2

Vậy x = 2 hoặc -2

|2x - 5| = 13

      2x = 13 + 5

       2x = 18

         x = 9

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

\(\Leftrightarrow\orbr{\begin{cases}x-3=0\\x+2=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)

2)2x+35=-15

2x      =-15-35

2x      = -50

x        =-25

1)-16+23+x=-16

7+x          =-16

x             =-16-7

x             =-23

3)-13 * lxl =-26

lxl         =  -26:-13

lxl           =2

<=>x=-2 hoac x=2

5) (x-3).(x+2) =0

<=>\(\orbr{\begin{cases}x-3=0\\x+2=0\end{cases}}\) <=>\(\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)

a)  1 3 + 2 3 : x = − 7

⇔ 2 3 : x = − 7 − 1 3 ⇔ 2 3 : x = − 22 3 ⇔ x = 2 3 : − 22 3 ⇔ x = − 1 11

b)  2 3 : x = 1 , 4 − 12 5

⇔ 2 3 : x = − 7 5 ⇔ x = 2 3 : − 7 5 ⇔ x = − 10 21

c)  4 , 5 − 2 x .1 4 7 = 11 14

⇔ 4 , 5 − 2 x = 11 14 : 11 7 ⇔ 9 2 − 2 x = 1 2 ⇔ 2 x = 4 ⇔ x = 2

a) x = 2

b) x = 2

c) x = 2

d) x = 1

Vậy x = 6

a) 

\(13x+3=16\\ 13x=16-3\\ 13x=13\\ x=13:13\\ x=1\)

b) 

\(2x-138=24:23\\ 2x-138=\dfrac{24}{23}\\ 2x=\dfrac{24}{23}+138\\ 2x=\dfrac{3198}{23}\\ x=\dfrac{3198}{23}:2\\ x=\dfrac{1599}{23}\)

@ Nguyễn Quốc Đạt em bị nhầm đề bài nhé

2\(x\) - 138 = 2⁴ : 2³

2\(x\) - 138 = 2

2\(x\)           = 2 + 138

2\(x\)            = 140

  \(x\)            = 140 : 2

  \(x\)            = 70 

1) 2x – (3 – 5x) = 4( x +3)

<=>2x-3+5x=4x+12

<=>2x-3+5x-4x-12=0

<=>3x-15=0

<=>x=5

2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)

<=>10x-15-20x+28=19-2x-22

<=>10x-15-20x+28-19+2x+22=0

<=>-8x+16=0

<=>x=2

tham khảo

1) 2x – (3 – 5x) = 4( x +3)

<=>2x-3+5x=4x+12

<=>2x-3+5x-4x-12=0

<=>3x-15=0

<=>x=5

2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)

<=>10x-15-20x+28=19-2x-22

<=>10x-15-20x+28-19+2x+22=0

<=>-8x+16=0

<=>x=2

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