a, (x + 30) – 75 = 125

=> x + 30 = 125 + 75 = 200

=> x = 200 – 30

=> x = 170

Vậy x = 170

b, x – 72 : 36 = 18

=> x – 2 = 18

=> x = 18 + 2 = 20

Vậy x = 20

c, x – 17 = 54

=> x = 54 +17

=> x = 71.

Vậy x = 71

d, 36 – (x – 2) = 12

=> x – 2 = 36 – 12

=> x = 24 + 2 = 26

Vậy x = 26

e, 9x – 7 = 837

=>9x = 837 + 7 = 844

=> x =  844 9

Vậy x =  844 9

f, (x – 15) – 107 = 0

=> x – 15 = 107

=> x = 107 +15

=> x = 122.

Vậy x = 122

g, 134 + (116 – x) = 145

=> 116 – x = 145 – 134

=> x = 116 – 11

=> x = 5.

Vậy x = 5

a: =>25-4x=1

=>4x=24

hay x=6

b: =>2x-4=0

hay x=2

c: =>x-35=115

hay x=150

d: =>x-2=12

hay x=14

e: =>x-36=216

hay x=252

a, \(12\left(x-1\right)=0\Rightarrow x-1=0\Rightarrow x=1\)

b, \(\left(x-47\right)-115=0\Rightarrow x-47-115=0\)

\(\Rightarrow x=115+47=162\)

c, \(x-36:18=12\Rightarrow x-2=12\Rightarrow x=14\)

d, \(\left(x-36\right):18=12\Rightarrow x-36=216\Rightarrow x=252\)

Chúc bạn học tốt!!!

\(a.12\left(x-1\right)=0\)

\(x-1=0:12\)

\(x-1=0\)

\(x=0+1\)

\(x=1\)

\(b.\left(x-47\right)-115=0\)

\(x-47=0+115\)

\(x-47=115\)

\(x=115+47\)

\(x=162\)

\(c.x-36:18=12\)

\(x-36=12.18\)

\(x-36=216\)

\(x=216+36\)

\(x=252\)

\(d.\left(x-36\right):18=12\)

\(x-36=12.18\)

\(x-36=216\)

\(x=216+36\)

\(x=252\)

a) 12 . ( x - 1 ) = 0

x - 1 = 0 : 12

x - 1 = 0

x = 0 + 1

x = 1

b) ( x - 47 ) - 115 = 0

x - 47 = 0 + 115

x - 47 = 115

x = 115 + 47

x = 162

c) x - 36 : 18 = 12

x - ( 36 : 18) = 12

x - 2 = 12

x = 12 + 2

x = 14

d) (x - 36) : 18 = 12

x - 36 = 12 . 18

x - 36 = 216

x = 216 + 36

x = 252

a) (x – 45).27 = 0 ó x – 45 = 0 ó x = 45

b) 41.(2x – 8).13 = 0 ó 2x – 8 = 0 ó x = 4

c) (x – 36):18 = 12 ó x – 36 = 12.18 ó x = 216 + 36 ó x = 252

d) 43.(x – 18) = 86 ó x – 18 = 86:43 ó x = 2+18 ó x = 20

e) 96 : (121 – x) = 4 ó 121 – x = 96 : 4 ó 121 – x = 24 ó x =      121 – 24 ó x = 97

f) 340 : (15x+5) = 17 ó 15x + 15 = 340 :17 ó 15x + 5 = 20 ó 15x = 20 – 5 ó 15x = 15 ó x = 1