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`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

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=4^2

10 + 2.x=16

2.x=16-10

2.x=6

x=6:2

x=3

c) 2x - 138 = 2^3 . 3^2

2x - 138 = 8.9

2x - 138 = 72

2x=72+138

2x=210

x=210:2

x=105

d) 231 - (x - 6) = 133 : 13

 (đề sai)

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

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

                  x - 3   = 25 : 5 = 5

                  x        = 5 + 3

                  x        = 8

B) 10 + 2 . x = 4⁵ : 4³

     10 + 2x   = 4² = 16

             2x   = 16 - 10 = 6

               x   = 6 : 2

               x   = 3

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

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

=>5.(x-3)=25

=>x-3=25:5

=>x-3=5

=>x=8

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

=>10+2x=4^2

=>10+2x=16

=>2x=16-10

=>2x=6

=>x=3

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 + 2x = 4⁵ : 4³

      10 + 2 x = 4²

        10 + 2. x = 16

                 2x = 16 = 10

                2x = 6

                 x = 6 : 2

                 x = 3

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

b)10+2x=4⁵:4³

10+2x=4²

10+2x=16

2x=16-10

2x=6

  x=6:2

  x=3

vậy x=3

\(a.70-5.\left(x-3\right)=45\)

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

            \(70-\left(x-3\right)=9\)

                          \(x-3=70-9\)

                          \(x-3=61\)

                                    \(x=61+3\)

                                    \(x=64\)

\(b.10+2.x=4^5:4^3\)

     \(10+2.x=4^2=16\)

                 \(2.x=16-10\)

                 \(2.x=6\)

                     \(x=6:2\)

                    \(x=3\)

Học tốt !

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

    \(5.\left(x-3\right)=70-45\)

    \(5.\left(x-3\right)=25\)

    \(x-3=25:5\)

    \(x-3=5\)

   \(x=5+3\)

   \(x=8\)

b) \(10+2.x=4^5:4^3\)

     \(10+2.x=4^2\)

     \(10+2.x=16\)

      \(2x=16-10\)

      \(2x=6\)

      \(x=6:2\)

      \(x=3\)

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+2x=4^5:4^3

10+2x=4^2

10+2x=16

2x=16-10

2x=6

x=6:2

x=3

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

         65 . ( x - 3 ) = 45

                    x - 3 = 45 . 65

                    x - 3 = 2925

                         x = 2925 + 3

                         x = 2928

b) 10 + 2x = 4⁵ : 4³

    10 + 2x = 4^5-3

    10 + 2x = 4²

    10 + 2x = 16

            2x = 16 - 10

            2x = 6

              x = 6 : 2

              x = 3

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

<=>5(x-3)=70-45

<=>5(x-3)=35

<=>x-3=35:5

<=>x-3=7

<=>x=7+3

<=>x=10

b)10+2x=4⁵:4³

<=>10+2x=4²

<=>10+2x=16

<=>2x=16-10

<=>2x=6

<=>x=6:2

<=>x=3

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

          5 . ( x - 3 ) = 70 - 45  

          5 . ( x - 3 ) = 25 

               ( x - 3 ) = 25 : 5                         Mik làm cho ban j rồi nhé bạn nhớ làm cho mik nha

                 x - 3   = 5

                 x        = 5 - 3 

                 x        = 2

b) 10 + 2 . x = 4⁵ : 4⁵

   10  + 2 . x = 4

           2 . x = 10 - 4

           2 . x = 6

                x = 6 : 2

                x = 3 

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

b,\(2x-138=8x9=72\)

\(2x=138+72=210\)

\(x=210:2=105\)

c,\(10+2x=4^2\)\(=16\)

\(2x=16-10=6\)

\(x=6:2=3\)

d, 231 – (x- 6) = 1339 : 13

231 – (x – 6) = 103

x – 6 = 231 – 103

x – 6 = 128

x = 128 + 6

x = 134

Vậy x = 134

a, \(70-5.\left(x-3\right)=45\\ =>5.\left(x-3\right)=70-45=25\\ =>x-3=25:5=5\\ =>x=5+3=8\)

b, \(10+2.x=4^5:4^3\\ =>2.x=\left(4^5:4^3\right)-10=16-10=6\\ =>x=6:2=3\)

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

b, 10 + 2 .\(x\) = \(4^5:4^3\)

10 + 2 . \(x\) = 1024 : 64

10 + 2 .\(x\) = 16

2 .\(x\) = 16 - 10

2 . \(x\) = 6

\(x\) = 6 : 2

\(x\) = 3

Vậy \(x\) = 3

Chúc bạn học tốt !!!

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