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=17

3x=27+6

3x=33

x=33:3

x=11

li-ke cho mình nha Duong Thi Hoai My

(3x-6).3= 3 mũ 4

nếu gì nguyện cau chúc củat bai t0an va thay s0 thi  sa0

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)= 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

đề câu b sai rồi bạn 219 hay 209

c, ( 3x - 6 ) . 3 = 3⁴

=> 3x - 6 = 3⁴:3

=> 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(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) \(\left(3x-6\right)3=3^4\)

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

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

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

\(\Rightarrow3x=27-6\)

\(\Rightarrow3x=21\)

\(x=21:3\)

\(\Rightarrow x=7\)

a) 124 + (118 - x) = 217

118 - x = 217 - 124

118 - x = 93

x = 118 - 93

x = 25

b) 156 - (x + 61) = 82

x + 61 = 156 - 82

x + 61 = 74

x = 74 - 61

x = 13

c) 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

d) (3x - 6).3 = 3⁴

3x - 6 = 3⁴ : 3

3x - 6 = 3³

3x - 6 = 27

3x = 27 + 6

3x = 33

x = 33 : 3

x = 11

e) 231 - (x - 6) = 1339 : 13

231 - (x - 6) = 103

x - 6 = 231 - 103

x - 6 = 128

x = 128 + 6

x = 134

a) 124 + (118 - x) = 217

118 - x = 217 - 124

118 - x = 93

x = 118 - 93

x = 25

b) 156 - (x + 61) = 82

x + 61 = 156 - 82

x + 61 = 74

x = 74 - 61

x = 13

c) 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

d) (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

e) 231 - (x - 6) = 1339 : 13

231 - (x - 6) = 103

(x - 6) = 231 - 103

x - 6 = 128

x = 128 + 6

x = 134

cô cấm dùng máy tính -) 

lớp 9 ms đc dùng:_)

a.x=16

b.x=11

c.x=16

a, \(219-7\left(X+1\right)=100\)

\(\Rightarrow219-7X-7=100\)

\(\Rightarrow7X=219-7-100=112\)

\(\Rightarrow X=112:7=16\)

b,\(\left(3X-6\right)x3=3^4\)

\(\Rightarrow3X-6=81:3=27\)

\(\Rightarrow3X=27+6=33\)

\(\Rightarrow X=33:3=11\)

c,\(3636:\left(12X-91\right)=36\)

\(\Rightarrow12X-91=3636:36=101\)

\(\Rightarrow12X=101+91=192\)

\(\Rightarrow X=192:12=16\)

Đúng luôn nên...hằng ngày k cho mk 3 lần, bao h đủ 100  lần thì tui nhé

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 = 27 + 6

3x = 33

x = 11

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

      ( 3 x - 6 ) . 3 = 81

              3x - 6 = 81 : 3

                3x - 6 = 27

                        3x = 27 + 6

                         3x = 33

                               x = 33 : 3

                                x = 11