a) (x-35)-120=0

 x-35= 120

➩x = 155

        b)310-(118-x)=217

118 -x = 93

➩ x = 25

  c)156-(x+61)=82

➩ x  + 61 = 74

➩ x = 13

a: Ta có: \(x-35-120=0\)

\(\Leftrightarrow x-155=0\)

hay x=155

b: Ta có: \(310-\left(118-x\right)=217\)

\(\Leftrightarrow118-x=93\)

hay x=25

c: Ta có: \(156-\left(x+61\right)=82\)

\(\Leftrightarrow x+61=74\)

hay x=13

a) (x-35)-120=0

      x-35         =120

      x              =155

b)310-(118-x)=217

            118-x=93

                   x=25

c)156-(x+61)=82

            x+61=74

            x      =13

a)(x-35)-120=0                            b)124+(118-x)=217                             c)156-(x+61)=82

x-35          = 0+120=120                118-x         =217-124=93                     x+61        = 156-82=74

x              = 120+35=155               x               = 118-93=25                     x              =74-61=13

suy ra x=155                                suy ra x= 25                                       suy ra x=13

a) ( x - 35 ) - 120 = 0

<=> x - 35 = 120

<=> x = 155

b) 124 + ( 118 - x ) = 217

<=> 118 - x = 93

<=> x = 25

c) 156 - ( x + 61 ) = 82

<=> x + 61 = 74

<=> x = 13

a, (x - 35) - 120 = 0

=> x - 35 = 120

=> x = 155

b, 124 + (118 - x) = 217

=> 118 - x = 93

=> x = 25

c, 156 - (x + 61) = 82

=> x + 61 = 74

=> x = 13

a) x = 155

b) x = 25

c) x = 13

a) (x - 35) - 120 = 0

x - 35 = 120

x = 155

b) 124 + (118 - x) = 217

118 - x = 93

x = 25

c) 156 - (x + 61) = 82

x + 61 = 74

x = 13

Dùng qui tắc chuyển vế      

a, ( x - 35 ) - 120 = 0

( x - 35 ) = 0 + 120

x - 35 = 120

x = 120 + 35

x = 155

Vậy x = 155

b, 124 + ( 118 - x ) = 217

( 118 - x ) = 217 - 124

118 - x = 93

x = 118 - 93

x = 25

Vậy x = 25

c, 156 - ( x + 61 ) = 82

( x + 61 ) = 156 - 82

x + 61 = 74

x = 74 - 61

x = 13 

Vậy x = 13

a) \(\left(x-35\right)-120=0\)

\(\Rightarrow x-35=0+120\)

\(\Rightarrow x=120+35\)

\(\Rightarrow x=155\)

b) \(124+\left(118-x\right)=217\)

\(\Rightarrow118-x=217-124\)

\(\Rightarrow x=118-93\)

\(\Rightarrow x=25\)

c) \(156-\left(x+61\right)=82\)

\(\Rightarrow x+61=156-82\)

\(\Rightarrow x=74-61\)

\(\Rightarrow x=13\)

a) \(x=155\)

b) \(x=25\)

c) \(x=13\)

(Nhớ k cho mình với nhoa!)

a) ( x - 35 ) - 120 = 0

<=> x - 35 = 120

<=> x = 155

b) 124 + ( 118 - x ) = 217

<=> 118 - x = 93

<=> x = 25

c) 156 - ( x + 61 ) = 82

<=> x + 61 = 74

<=> x = 13

(x-35)-120=0

x-35         = 0 + 120

x-35          = 120

x               = 120 + 35

x                = 155

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

(x-35)-120=0

x-35 = 0+120

x-35 = 120

x = 120-35

x = 85

124 + (118-x)=217

118-x=217-124

118-x=93

x=118-93

x=25

156-(x+61)=82

x+161=156-82

x+161=74

x=161-74

x=87

do la bai cua minh,co cho sai nao thi sua cho minh nhe

a,(x-35)-120=0
    x-35=120
    x=155
b,124+(118-x)=217
118-x=217-124
 118-x=  93
       x=25
c,156-(x+61)=82
    x+61=156-82
     x+61=74
x=13
 P/S: Bạn Hãy k hộ mk nha ^.^

Ta có: a, (x - 35) - 120 = 0

(x - 35) = 0 + 120

x - 35 = 120

x = 120 + 35

x = 155

b, 124 + ( 118 - x) = 217

(118 - x) = 217 - 124

118 - x = 93

x = 118 - 93

x = 25

c, 156 - ( x + 61) = 82

x + 61  = 156 - 82

x + 61 = 74

x = 74 - 61

x = 13

a,=>x-35=120

x=120+35

x=165

b,=>118-x=217-124

118-x=93

x=118-93

x=25

c,=>x+61=156-82

x+61=74

x=74-61

x=13

a) \(\left(x-35\right)-120=0\)

\(x-35=0+120\)

\(x-35=120\)

\(x=120+35\)

\(x=155\)

b) \(156.\left(x+61\right)=82\)

\(x+61=82:156\)

\(x+61=\frac{41}{78}\)

\(x=\frac{41}{78}-61\)

\(x=-\frac{4717}{78}\)

c) \(124+\left(118-x\right)=217\)

\(118-x=217-124\)

\(118-x=93\)

\(x=118-93\)

\(x=25\)