47x+52x+x=4.57

x.(47+52+1)=300

x.100         =300

x                =300:100

x                =3

a) ( x - 50 ) . 32 = 0

x - 50 = 0 : 32

x- 50 = 0

x = 0 + 50

x = 50

b) 55 - ( 20 - x ) = 55

20 - x = 55 - 55

20 - x = 0

x = 0 + 20 

x = 20

c) 47x + 52x + x = 4.75

47x + 52x + x = 300

x ( 47 + 52 + 1 ) = 300

x . 100 = 300

x = 300 : 100

x = 3

(x-50)x32=0

(X-50)     =0:32

(X-50)     =0

X           =0+50

X           =50

2,55-(20-X)=55

        (20-X)=55-55

        (20-X)=0

               X=0+20

                X=20

3,X= 3 

Chúc bạn hoàn thành bài nhé!

(X-3)-120=0

X-123=0

X=123

8x-3=0

8x=3

x=3/8

124+(118-x)=217

118-x=93

x=25

156-(x+61)=82

x+61=74

x=13

814-(x-305)=712

x-305=102

x=407

(X-32)÷16=48

x-32=768

x=800

X-32: 16=48

x-2=48

x=50

( x - 3 ) - 120 = 0

<=> x - 3 = 120

<=> x      = 120 + 3

<=> x      = 123

       8x - 3 = 0

    <=> 8x  = 3

    <=> x     = 3 : 8

    <=> x     = 3/8

124 + ( 118 - x ) = 217

<=> 118 - x      = 217 - 124

<=>  118 - x     = 93

<=>       x          = 118 - 93

<=>       x          = 25

          156 - ( x + 61 ) = 82

      <=>     x + 61     = 156 - 82

     <=>      x + 61    = 74

     <=>       x            = 74 -61

      <=>     x             = 13

814 -( x - 305 ) = 712

<=> x - 305 = 814-712

<=> x - 305 = 102

<=>    x        =102 + 305

<=>    x        = 407

       ( x - 32) : 16 = 48

   <=> x - 32         = 48 x 16

   <=>  x - 32        = 768

   <=>       x           = 768 + 32

   <=>       x            = 800

x - 32 : 16 = 48

<=> x - 2   = 48

<=>  x       = 48 + 2

<=>   x     = 50

1/ (X - 3) -120 = 0

     X - 3           = 0 +120

     X - 3           = 120

     X                = 120 + 3

     X                = 123

2/ 8X - 3 = 0

    8X      = 0 + 3

    8X      = 3

      X      = 3 : 8

      X      = 3/8

3/ 124 + ( 118 - X ) = 127

                 118 - X  = 127 - 124

                 118 - X  = 3

                          X  = 118 -3

                          X  = 115

4/ 156 - ( X + 61 ) = 82

               X + 61    = 156 - 82

               X + 61    = 74

               X            = 74 - 61

               X            = 13

5/ 814 - ( X - 305 ) = 712

               X - 305    = 814 - 712

               X - 305    = 102 

               X             = 102 + 305

               X             = 407

6/ ( X - 32 ) : 16 = 48

      X - 32           = 48 x 16

      X - 32           = 768

      X                  = 768 + 32

      X                  = 800

7/ X - 32 : 16 = 48

    X - 2          = 48

    X               = 48 + 2

    X               = 50

a) \(x+5=20-\left(12-7\right)\)

\(\Rightarrow x+5=20-5\)

\(\Rightarrow x+5=15\)

\(\Rightarrow x=15-5\)

\(\Rightarrow x=10\)

b) \(15-\left(3+2x\right)=2^2\)

\(\Rightarrow3+2x=15-4\)

\(\Rightarrow3+2x=11\)

\(\Rightarrow2x=11-3\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=\dfrac{8}{2}\)

\(\Rightarrow x=4\)

c) \(-11-\left(19-x\right)=50\)

\(\Rightarrow19-x=-11-50\)

\(\Rightarrow19-x=-61\)

\(\Rightarrow x=61+19\)

\(\Rightarrow x=80\)

d) \(159-\left(25-x\right)=43\)

\(\Rightarrow25-x=159-43\)

\(\Rightarrow25-x=116\)

\(\Rightarrow x=25-116\)

\(\Rightarrow x=-91\)

e) \(\left(79-x\right)-43=-\left(17-52\right)\)

\(\Rightarrow\left(79-x\right)-43=52-17\)

\(\Rightarrow79-x-43=35\)

\(\Rightarrow36-x=35\)

\(\Rightarrow x=1\)

f) \(\left(7+x\right)-\left(21-13\right)=32\)

\(\Rightarrow7+x-8=32\)

\(\Rightarrow x-1=32\)

\(\Rightarrow x=32+1\)

\(\Rightarrow x=33\)

g) \(-x+20=-15+8+13\)

\(\Rightarrow-x+20=6\)

\(\Rightarrow x=20-6\)

\(\Rightarrow x=14\)

h) \(-\left(-x+13-142\right)+18=55\)

\(\Rightarrow x-13+142+18=55\)

\(\Rightarrow x+147=55\)

\(\Rightarrow x=55-147\)

\(\Rightarrow x=-92\)

2: \(\Leftrightarrow x-34=97\)

hay x=133

10 . 58 . 5 + 32 . 2 . 25 + 50 . 10
= 50 . 58 + 50 . 32 + 50 . 10
= 50 . ( 58 + 32 + 10 )
= 50 . 100
= 5000
20 - 2 . ( x - 1 ) = 4
\(\Rightarrow\)2 . ( x - 1 ) = 16
\(\Rightarrow\)x - 1 = 16 : 2
\(\Rightarrow\)x - 1 = 8
\(\Rightarrow\)x = 9
( x + 1 )² = 9 = 3² = ( -3 )²

\(\Rightarrow\orbr{\begin{cases}x+1=3\\x+1=-3\end{cases}\Rightarrow\orbr{\begin{cases}x=3-1\\x=3+1\end{cases}\Rightarrow}\orbr{\begin{cases}x=2\\x=4\end{cases}}}\)

a,=50.28+32.50+50.10=50.(28+32+10)=50.70=3500

b.2(x-1)=20-4

x-1=16/2

x=8+1=9

c,

d) 12x 156 - 12 x 55 - 12

= 12 x ( 156 - 55 - 12 )

= 12 x 100

= 1200

e ) 12 x 11 + 21 x 11 + 11 x 33

= ( 12+ 21 + 33) x 12

= 66 x 11

= 726

g) 132 x 11 - 11 x 32 - 54 x 11

= ( 132 - 32 - 54 ) x 11

= 46 x 11

= 506

d) 12 x 156 - 12 x 55 - 12 = 12x(156 - 55 - 1 ) = 12 x 100 = 1200

e) 12 x 11 + 21 x 11 + 11 x 33 = 11  x ( 12 + 21 + 33 ) = 11  x 66 = 726

g) 132 x 11 - 11 x 32 - 54 x 11 = 11 x ( 132 - 32 - 54 ) = 11 x 46 = 506

d) \(12\times156-12\times55-12\) \(=12\times\left(156-55-1\right)\)

                                                         \(=12\times100=1200\)

e) \(12\times11+21\times11+11\times33\)\(=11\times\left(12+21+33\right)=11\times66=726\)

g) \(132\times11-11\times32-54\times11\) \(=11\times\left(132-32-54\right)=11\times46=506\)

a,\(\left(x-15\right):50+22=24\)

\(< =>\frac{\left(x-15\right)}{50}=2< =>x-15=100\)

\(< =>x=100+15=115\)

b,\(42-\left(2x+32\right)+12:2=6\)

\(< =>42-2x-32=0\)

\(< =>10-2x=0< =>x=\frac{10}{2}=5\)

Làm nốt :

c) \(134-2\left\{156-6\cdot\left[54-2\cdot\left(9+6\right)\right]\right\}\cdot x=86\)

=> 134 - 2{156 - 6 . [54 - 2 . 15]} . x = 86

=> 134 - 2{156 - 6 . [54 - 30]} . x = 86

=> 134 - 2{156 - 6. 24} . x = 86

=> 134 - 2{156 - 144} . x = 86

=> 134 - 2.12 . x = 86

=> 134 - 24 . x = 86

=> 24.x = 48

=> x = 2

Bài 2 : a) 120 : [21 - (4x - 4)] = 2³.3

=> 120 : [21 - (4x - 4)] = 8.3

=> 120 : [21 - (4x - 4)] = 24

=> 21 - (4x - 4) = 5

=> 4x - 4 = 16

=> 4x = 20

=> x = 5

b) 3.[205 - (x - 9)] - 486 = 0

=> 3.[205 - (x - 9)] = 486

=> 205 - (x - 9) = 162

=> x - 9 = 205 - 162 = 43

=> x = 43 + 9 = 52

c) 204 - 2{200 - 5.[64 - 2.(11 + 6)]} . x = 4

=> 204 - 2{200 - 5.[64 - 2.17]} . x = 4

=> 204 - 2{200 - 5 .[64 - 34]}.x = 4

=> 204 - 2{200 - 5.30} . x = 4

=> 204 - 2{200 - 150}.x = 4

=> 204 - 2.50 . x = 4

=> 2.50.x = 200

=> 100.x = 200

=> x = 2