\(a,12\left(x-1\right)=0\\ x-1=0\\ x=1\\ b,45+5\left(x-3\right)=70\\ 5\left(x-3\right)=25\\ x-3=5\\ x=8\\ c,3.x-18:2=12\\ 3.x-9=12\\ 3.x=21\\ x=7\)

12(x-1)=0

     (x-1)=0:12

      x-1=0

      x=0+1

      x= 1

Vậy x= 1

12 ( x - 1 ) = 0
       x - 1   = 0 : 12
       x - 1   = 0
=>   x        = 1

A, 70 - 5 . ( x - 3 ) = 45

          5.( x - 3 )    = 70 - 45

          5. ( x - 3 )  = 25

                x - 3    = 25 : 5

                x  - 3    = 5

                     x     = 5 + 3 

                     x = 8

B, 5^{2x - 3} - 2.5² = 5².3

   5^{2x - 3}   - 2.25 = 25.3

   5^{2x - 3}   - 50    = 75

  5^{2x - 3}             = 75 + 50

  5^{2x - 3}                = 125

   5^{2x - 3}               = 5³

      2x - 3          = 3

        2x             = 3 + 3 

        2x             = 6

           x            = 6 : 2 

             x          = 3

1)

a) 2x + 5 = 3⁴ : 3²

2x + 5 = 3²

2x + 5 = 9

2x = 9 - 5

2x = 4

x = 4 : 2

x = 2

b) (3x - 24).73 = 2.74

(3x - 24).73 = 148

3x - 24 = 148/73

3x = 148/73 + 24

3x = 1900/73

x = 1900/73 : 3

x = 1900/219

c) [3.(42 - x)] + 15 = 23.3

126 - 3x + 15 = 69

141 - 3x = 69

3x = 141 - 69

3x = 72

x = 72 : 3

x = 24

d) 126 + (132 - x) = 300

132 - x = 300 - 126

132 - x = 174

x = 132 - 174

x = -42

2)

a) 120 - (x + 55) = 60

x + 55 = 120 - 60

x + 155 = 60

x = 60 - 55

x = 5

b) (7x - 11).3 = 25.52 + 200

(7x - 11).3 = 1500

7x - 11 = 1500 : 3

7x - 11 = 500

7x = 500 + 11

7x = 511

x = 511 : 7

x = 73

c) 2x + 2x + 4 = 544

4x = 544 - 4

4x = 540

x = 540 : 4

x = 135

3) 

a) 10 + 2x = 49 : 47

10 + 2x = 49/47

2x = 49/47 - 10

2x = -421/47

x = -421/47 : 2

x = -421/94

b) 70 - 5(x - 3) = 45

5(x - 3) = 70 - 45

5(x - 3) = 25

x - 3 = 25 : 5

x - 3 = 5

x = 5 + 3

x = 8

c) 4 + 95 : x = 143 : 142 - 23

4 + 95 : x = -3123/142

95 : x = -3123/142 - 4

95 : x = -3691/142

x = 95 : (-3691/142)

x = -13490/3691

+/ 70-5(x-3)=45

        5(x-3)=70-45

         5(x-3)=25

            x-3=25:5

            x-3=5

            x   =5+3

            x   =8

+/ x-38:16=12

    x-2,375=12

    x         =12+2.375

    x         = 14,375

+/   10+2x=4⁵:4³

         10+2x=16

            2x=16-10

            2x=6

              x=6:2

              x=3

k và kết bạn với mình nha <3

a,  70 - 5 ( x - 3 ) = 45

⇔ 5 . x - 3 = 70 - 45

⇔ 5 x - 3 = 35

⇔ x - 3 = 35 : 5 ⇔ x - 3 = 7

⇔ x = 10

b,  10 + 2 x = 4 5 : 4 3

⇔ 10 + 2 x = 4 2 ⇔ 10 + 2 x = 16

⇔ 2 x = 4 ⇔ x = 2

c,  60 - 3 x - 2 = 51

⇔ 3 x - 2 = 60 - 51

⇔ 3 x - 2 = 9

⇔ x - 2 = 3 ⇔ x = 5

d,  4 x - 20 = 2 5 : 2 3

⇔ 4 x - 20 = 2 2 ⇔ 4 x - 20 = 4

⇔ 4 x = 24 ⇔ x = 6

Tách ?

`a, 70 -5.(x-3) =45`

`=> 5.(x-3)= 70-45`

`=> 5.(x-3)=25`

`=>x-3=25:5`

`=>x-3=5`

`=>x= 5+3`

`=>x=8`

______

`b,10 + 2.x = 4^5:4^3`

`=> 10 + 2.x = 4^(5-3)`

`=> 10 + 2.x =4^2=16`

`=> 2.x=16-10`

`=>2.x=6`

`=>x=6:2`

`=>x=3`

_____

`c,60-3.x-2=51`

`=>  60-3.x= 51+2`

`=> 60-3.x=53`

`=>3.x=60-53`

`=> 3.x= 7`

`=>x= 7/3`

____

`d, 4.x-20=2^5:2^3`

`=> 4.x-20=2^(5-3)`

`=> 4.x-20=2^2`

`=> 4.x= 4+20`

`=>4.x=24`

`=>x=24:4`

`=>x=6`

____

`2^x . 4=16`

`=> 2^x=16:4`

`=>2^x= 4`

`=>2^x=2^2`

`=>x=2`

____

`f, 3^x . 3=243`

`=>3^x=243:3`

`=> 3^x=81`

`=> 3^x=3^3`

`=>x=3`

_____

`g, 64. 4^x =16^8`

`=> 4^3 . 4^x=(4^2)^8`

`=> 4^3 . 4^x = 4^(16)`

`=> 4^x= 4^(16-3)`

`=>4^x=4^(13)`

`=>x=13`

_____

`2^x . 16^2 =1024`

`=> 2^x= 1024 : 16^2`

`=>2^x=4`

`=>2^x=2^2`

`=>x=2`

a: =>5(x-3)=25

=>x-3=5

=>x=8

b: =>2x=16-10=6

=>x=3

c: =>58-3x=51

=>3x=7

=>x=7/3

d: =>4x-20=4

=>4x=24

=>x=6

e: =>2^x=4

=>2^x=2^2

=>x=2

f: =>3^x=81

=>3^x=3^4

=>x=4

g: =>4^x*4^3=4^16

=>x+3=16

=>x=13

h: =>2^x=1024/256=4=2^2

=>x=2

5 x ( 2x - 3 ) = 70-45=25

2x - 3           = 25:5=5

2x                =5-3=2

x                  =2:2=1

\(70-5\times\left(2x-3\right)=45\)

\(\Leftrightarrow5\times\left(2x-3\right)=70-45\)

\(\Leftrightarrow5\times\left(2x-3\right)=25\)

\(\Leftrightarrow2x-3=25:5\)

\(\Leftrightarrow2x-3=5\)

\(\Leftrightarrow2x=5+3\)

\(\Leftrightarrow2x=8\)

\(\Leftrightarrow x=8:2\)

\(\Leftrightarrow x=4\)

Vậy  \(x=4\)

mik nhé !!

a)70-5.(x-3)=45

       5.(x-3)=70-45

       5.(x-3)=25

          (x-3)=25:5

          (x-3)=5

            x   =5+3

            x    =8

a) 70 - 5 . (x - 3) = 45

= 70 - 5 . 3 - x = 45

= 70 - 65 - x = 45

= 15 - x = 45

x = 15 - 45

x = -30

b) x - (2x - 4) = 0

= x - (20.x - 4) = 0

= 0 + 4 + 20 = x

=> x = 0 + 4 + 20

x = 24

Đs:

Chả biết đúng hay không nữa

a. 70 - 5 ( x -3 ) = 45 

=>      5 ( x-3 ) = 70 -45

=>      5 ( x-3 ) = 25

=>           x -3  = 25 : 5 

=>           x -3 = 5 

=>           x     = 5 + 3 

=>           x     = 8 

Vậy x = 8