\(2(x-51)=2\cdot2^3+20\)

\(2(x-51)=2\cdot8+20\)

\(2(x-51)=16+20\)

\(2(x-51)=36\)

\(x-51=36:2\)

\(x-51=18\)

\(x=18+51\)

\(x=69\)

2 ( x - 51 ) = 2 . 2³ + 20

2 ( x - 51 ) = 2⁴ + 20 

2 ( x - 51 ) = 16 + 20 

2 ( x - 51 ) = 36

    ( x - 51 ) = 36 : 2 

     ( x - 51 ) = 18

       x            = 18 + 51

       x            = 69

Vậy x = 69

Tk nhé!!!

i) 2(x 51) = 2.23 + 20

\(2\times\left(x-51\right)=2\times2^3+20\)

\(2\times\left(x-51\right)=2^4+20\)

\(2\times\left(x-51\right)=16+20\)

\(2\times\left(x-51\right)=36\)

\(x-51=36:2\)

\(x-51=18\)

\(x=18+51\)

\(x=69.\)

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

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

\(5\times\left(x-3\right)=25\)

\(x-3=25:5\)

\(x-3=5\)

\(x=5+3\)

\(x=8.\)

2.(x-51)=2.2³+20

=>2.(x-51)=2.(2³+10)

=>x-51=2³+10

=>x-51=8+10

=>x-51=18

=>x=51+18

=>x=69

Lê Chí Cường nhah nhỉ 

giải thích nhé

\(2\left(x-51\right)=2.2^2+20.\)

\(\Leftrightarrow2x-102=2.4+20\)

\(\Leftrightarrow2x-102=28\)

\(\Leftrightarrow2x=28+102\)

\(\Leftrightarrow2x=130\)

\(\Leftrightarrow x=130\div2\)

\(\Leftrightarrow x=65\)

2( x - 51 ) = 2.2² + 20

2( x - 51 ) = 2.4 +20

2( x - 51 ) = 28

    x - 51    = 28 : 2

     x - 51   = 14

           x    = 14 + 51

           x    =   65

2(x-51)=28

x-58=28:2=14

x = 14 + 58=72

a)4.(x-3)=7.2-1.10

4.(x-3)=14-10

4.(x-3)=4

x-3=4:4

x-3=1

x=1+3

x=4

b)2.(x-51)=2.2.3+20

2.(x-51)=32

x-51=32:2

x-51=16

x=16+51

x=67

c)9.x-1=9

9.x=9+1

9.x=10

x=10:9

x=1,1111111...

(x-2).4=16

x-2=16:4

x-2=4

x=4+2

x=6

a, 2(x - 51) = 2.2³ + 20

=> 2(x - 51) = 2.8 + 20

=> 2(x - 51) = 16 + 20

=> 2(x - 51) = 36

=> x - 51 = 18

=> x = 69

vậy_

b, 3²(x + 4) - 5² = 5.2²

=> 9(x + 4) - 25 = 5.4

=> 9x + 36 - 25 = 29

=> 9x + 9 = 29

=> 9x = 20

=> x = 20/9

vậy_

(x-51) = 2.2³ + 20

(x-51) =  2.8 + 20

(x-51) = 16 +20

(x-51) = 36

x       = 36 +51

x       = 87

vậy x = 87

giải thích đi nha

Tìm x, biết:

a) 198 - ( x + 4 ) = 120

(x+4) = 198-120

x+ 4 =78

x= 78 - 4

x= 74

b) 2(x-51) = 2.2³ + 20

2(x-51)=36

x-51 = 36:2

x-51=18

x=18+51

x=69

c) 450 : ( x - 19 ) = 50

x-19= 450:50

x-19=9

x=9+19

x=28

d)4(x-3) = 7² - 1¹⁰

4(x-3) =48

x-3 = 48:4

x-3=12

x=12+3

x=15

a) 198 - ( x + 4 ) = 120

=>x+4=78

=>x=744

b) 2(x-51) = 2.2³ + 20

=>

a) 198 - ( x + 4 ) = 120

              x + 4   = 198 - 120

              x + 4   = 78

              x         = 78 - 4

              x         = 74

b) 2 ( x - 51 ) = 2 . 2³ + 20

    2 ( x - 51 ) = 2⁴ + 20

    2 ( x - 51 ) = 16 + 20

    2 ( x - 51 ) = 36

         x - 51   = 36 : 2

         x - 51   = 18

         x          = 18 + 51 

         x          = 69

c) 450 : ( x - 19 ) = 50

              x - 19   = 450 : 50 

              x - 19   = 9

              x          = 9 + 19

              x          = 28

d) 4 ( x - 3 ) = 7² - 1¹⁰

    4 ( x - 3 ) = 49 - 1

    4 ( x - 3 ) = 48

         x - 3   = 48 : 4

         x - 3   = 12

         x        = 12 + 3

         x        = 15

Nhiều quá mk sợ mk làm sai, bn kiểm tra lại nha, nếu đúng thì t.i.c.k nhé !