a) 219 - 7 (x + 1) = 100 

 7 ( x + 1)= 219 -100

7 ( x+ 1) =119

x+1=119 : 7

x+1=17

x=17-1

x= 16

a) 219-7(x+1)=100

  7(x+1)=219-100

  7(x+1)=119

  x+1=119:7

  x+1=17

  => x = 16

b)(3x-6).3 = 3^4

  (3x-6).3 = 81

  3x-6= 81:3

  3x-6= 27

  3x    = 27-6

  3x=21

  => x= 7.

kik nha

(3x - 6) . 3 = \(3^4\)

(3x-6) = \(3^4-3\)

( 3x-6) =\(3^3\)

3x-6=27

3x = 27 +6

3x = 33

x = 33:3

x=11

a) 

<=> 219 - 7x - 7 = 100

<=>         -7x       = 100 - 219 + 7

<=>          -7x      = -112

<=>             x       = -112 : (-7)

<=>             x       = 16

b)

<=> 9x - 18 = 34

<=> 9x         = 34 + 18

<=> 9x         = 52

<=>   x         = 52 : 9

<=>   x         = 52/9

a)219-7(x+1)=100

         7(x+1)=219-100

         7(x+1)=119

            x+1 =119:7

            x+1 =17

            x     =17-1

            x     =16

b)  (3x-6).3=34

    3x-6      =34:3

    3x-6      =\(\frac{34}{3}\)

    3x         =\(\frac{34}{3}\)- 6

    3x         =\(\frac{16}{3}\)

      x         =\(\frac{16}{3}\): 3

      x         =\(\frac{16}{9}\)

ko bit ai         dung

a)

\(219-7\left(x+1\right)=100\)

\(\Rightarrow7\left(x+1\right)=119\)

\(\Rightarrow x+1=17\)

=> x = 16

Vậy x = 16

b)

\(\left(3x-6\right)3=3^4\)

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

=> x - 2 = 9

=> x = 7

Vậy x = 7

Giải:

a, 219 - 7(x + 1) = 100

7(x + 1) = 219 - 100

7(x + 1) = 119

x + 1 = 119 : 7

x + 1 = 17

x = 17 - 1

x = 16

b, (3x - 6) . 3 = 3⁴

(3x - 6) . 3 = 81

3x - 6 = 81 : 3

3x - 6 = 27

3x = 27 + 6

3x = 33

x = 33 : 3

x = 11

a. 219 - 7(x+1) = 100

    7(x+1)=119

     x+1=119:7

    x+1=17

    x=16

Vậy x=16

b. (3x - 6) . 3 = 3⁴

     3x-6=3⁴:3

     3x-6=3³

     3x=33

    x=11

Vậy x=11  

a) \(219-7\left(x+1\right)=100\)

\(\Leftrightarrow219-7x-7=100\)

\(\Leftrightarrow-7x=100-219+7=-112\)

\(\Leftrightarrow x=16\)

b) \(\left(3x-6\right)\cdot3=3^4\)

\(\Leftrightarrow\left(x-2\right)\cdot3^2=3^4\)

\(\Leftrightarrow x-2=3^2\)

\(\Leftrightarrow x=9+2=11\)

a) \(219-7\left(x+1\right)=100\)

\(\Rightarrow7\left(x+1\right)=119\)

\(\Rightarrow x+1=119:7\)

\(\Rightarrow x+1=17\)

\(\Rightarrow x=16\)

b) \(\left(3x-6\right)3=3^4\)

\(\Rightarrow\left(3x-6\right)=3^3:3\)

\(\Rightarrow\left(3x-6\right)=3^3\)

\(\Rightarrow\left(3x-6\right)=27\)

\(\Rightarrow3x=27-6\)

\(\Rightarrow3x=21\)

\(x=21:3\)

\(\Rightarrow x=7\)

219-7(x+1)=100

7(x+1)      =119

x+1          =17

x              =16
 

(3x-6).3=3^4

3x-6     =81/3

3x-6      =27

3x         =33

x=11

219 - 7 ( x + 1 ) = 100

        7 ( x + 1 ) = 219 - 100

        7 ( x + 1 ) = 119

            x + 1    = 119 : 7

            x + 1    = 17

           x           = 17 - 1

           x           = 16

( 3x - 6 ) . 3 = 3^4

  3x - 6  = 3^4 : 3

  3x - 6  = 3^3

  3x - 6  = 27

  3x       = 27 + 6

  3x       = 33

    x       = 33 : 3

    x       = 11

a)219-7(x+1)=100

7(x+1)=219-100

x+1=119/7

x+1=17

x=17-1

x=16

b)(3x-6)*3=64

3x-6=64/3

3x=64/3+6

3x=82/3

x=82/3:3

x=82/9

a) 219-7(x+1)=100

219-7x-7=100

-7x=100-219+7

-7x=-112

x=16

b) (3x-6).3=64

3x-6=64/3

3x=82/3

x=82/9

a) 7(x+1)=219-100

x+1 = 119:7

x= 17 -1

x=16

b) (3x-6).3=3⁴

3x-6 =3³

3x =27+6

x=33:3

x= 11

a ) 219 - 7 . ( x + 1 ) = 100

              7 . ( x + 1 ) = 119

                     x + 1   = 17

                           x   = 18

b ) ( 3x - 6 ) . 3 = 3 ⁴

       3x - 6        = 27

            3x        = 33

              x        = 11

a, => 7.(x+1) = 219 - 100 = 119

=> x+1 = 119 : 7 = 17

=> x = 17 - 1 = 16

b, => 3x-6 = 3^4 : 3 = 3^3 = 27

=> 3x = 27+6 = 33

=> x = 33 : 3 = 11

k mk nha

a) 219 - 7(x+1) = 100

7(x+1) = 219 - 100

7(x+1) = 119

x + 1 = 119 : 7

x + 1 = 17

      x = 17 - 1

      x = 16

b) ( 3x - 6 ) . 3 = 3⁴

3x - 6 = 3⁴ : 3

3x - 6 = 3³

3x - 6 = 27

3x = 27 + 6

3x = 33

  x = 33 : 3

  x = 11

a, 219-7(x+1)=100

=> 7(x+1)=119

=> x+1=17

=> x=16

b, (3x-6).3=3⁴

=> 3²(x-2)=3⁴

=> x-2 =9

=> x=11