a)50 + x = 180 - 120

 50 + x = 60

 x = 60-50 

 x = 10

b)20-x = 150-140

 20-x = 10

x = 20-10

x = 10

c) 25+x = 100-40

25+x=60

x= 60-25

x=35

d) 100+x =130-25

100+x = 105

x = 105-100

x = 5

e) 143+x = 174-22

143+x = 152

x = 152-143

x = 9 

ỦNG HỘ MK NHÁ

120 + ( 50 + x ) = 180

50 + x = 180 - 120

50 + x = 60

x = 60 - 50

x = 10

140 + ( 20 - x ) = 150

20 - x = 150 - 140

20 - x = 10

x = 20 - 10

x = 10

100 - ( 25 + x ) = 40

25 + x = 100 - 40

25 + x = 60

x = 60 - 25

x = 35

130 - ( 100 + x ) = 25

100 + x = 130 - 25

100 + x = 105

x = 105 - 100

x = 5

174 - ( 143 + x ) = 22

143 + x = 174 - 22

143 + x = 152

x = 152 - 143

x = 9

k mk nha 

Thanks nhìu

\(120+\left(50+x\right)=180\)

\(\Rightarrow50+x=180-120\)

\(\Rightarrow50+x=60\)

\(\Rightarrow x=60-50=10\)

Vậy x = 10

\(140+\left(20-x\right)=150\)

\(\Rightarrow20-x=150-140\)

\(\Rightarrow20-x=10\)

\(\Rightarrow x=20-10=10\)

Vậy x =x10

\(100-\left(25+x\right)=40\)

\(\Rightarrow25+x=100-40\)

\(\Rightarrow25+x=60\)

\(\Rightarrow x=60-25=35\)

Vậy x = 35

\(130-\left(100+x\right)=25\)

\(\Rightarrow100+x=130-25\)

\(\Rightarrow100+x=105\)

\(\Rightarrow x=105-100=5\)

Vậy x = 5

\(174-\left(143+x\right)=22\)

\(\Rightarrow143+x=174-22\)

\(\Rightarrow143+x=152\)

\(\Rightarrow x=152-143=9\)

Vậy x = 9

a) 12 + ( 5 + x ) = 20 

⇔ 5 + x = 8

⇔ x = 3

Vậy x = 3

b) 120 + ( 50 + x ) = 180

⇔ 50 + x = 60

⇔ x = 10

Vậy x = 10

c) 175 + (  30 - x ) = 200

⇔ 30 - x = 25

⇔ x = 5

Vậy x = 5

d) 130 - ( 100 + x ) = 25

⇔ 100 + x = 105

⇔ x = 5

Vậy x = 5

e) 145 - ( 125 + x ) = 12

⇔ 125 + x = 133

⇔ x = 8

Vậy x = 8

j) 5 ( x + 12 ) + 22 = 92

⇔ 5x + 60 + 22 = 92

⇔ 5x + 82 = 92

⇔ 5x = 10

⇔ x = 2

Vậy x = 2

g) 3 ( x + 23 ) + 6 = 96

⇔ 3x + 69 + 6 = 96

⇔ 3x + 75 = 96

⇔ 3x = 21

⇔ x = 7

Vậy x = 7

Tìm x : 

a) 12 + ( 5 + x ) = 20

5 + x =20 - 12

5 +  x = 8

x = 3 

b) 120 + ( 50 + x ) = 180

50 + x = 180-120

50 + x = 60

x = 60 - 50

x = 10

c) 175 + ( 30 - x ) = 200

30 -x = 200 - 175

30 - x = 25

x = 30-25

x=5

d) 130- ( 100 +x ) =25

100 + x =130 - 25

100+x= 105

x=105-100

x=5

e) 145 - (125+x) = 12

125+x = 145-12

125+x=133

x= 133-125

x=8

j) 5 (x+12) +22 = 92 

5 ( x+12) = 92 -22

5 (x+12)=70

x+12=70 : 5

x + 12 = 14

x = 14-12

x=2

g) 2 (x+23) + 6 =96

2 (x+23) = 96 - 6

2 (x+23)= 90

x+23=90:2

x+23=45

x= 45-23

x=22

CHÚC BẠN HỌC TỐT

a) 12 + ( 5 + x ) = 20

=> 5 + x = 20 - 12

=> 5 + x = 8

=> x = 8 - 5

tìm x :

a) 12 + ( 5 + x ) = 20 

b) 120 + ( 50 + x ) = 180

c) 175 + (  30 - x ) = 200

d) 130 - ( 100 + x ) = 25

e) 145 - ( 125 + x ) = 12

j) 5 ( x + 12 ) + 22 = 92

g) 3 ( x + 23 ) + 6 = 96

giúp mk nha mn mk cần gấp

=> x = 3

b) 120 + ( 50 + x ) = 180

=> 50 + x = 180 - 120

=> 50 + x = 60

=> x = 60 - 50

=> x = 10

c) 175 + ( 30 - x ) = 200

=> 30 - x = 200 - 175

=> 30 - x = 25

=> x = 30 - 25

=> x = 5

d) 130 - ( 100 + x ) = 25

=> 100 + x  = 130 - 25

=> 100 + x = 105

=> x = 105 - 100 

=> x = 5

nhầm lớp nha
nhớ phải chọn đúng lớp

33,33%=10,415625

0,1%=0,03125

130 : 90 x 100 = 144,4444444444444

a) \(70-\left(x-3\right)=45\)

\(x-3=70-45\)

\(x-3=25\)

\(x=25+3\)

\(x=28\)

b) \(12+\left(5+x\right)=20\)

\(5+x=20-12\)

\(5+x=8\)

\(x=8-5\)

\(x=3\)

c) \(130-\left(100+x\right)=25\)

\(100+x=130-25\)

\(100+x=105\)

\(x=105-100\)

\(x=5\)

d) \(175+\left(30-x\right)=200\)

\(30-x=200-175\)

\(30-x=25\)

\(x=30-25\)

\(x=5\)

e) \(\left(x+12\right)+22=92\)

\(x+12=92-22\)

\(x+12=70\)

\(x=70-12\)

\(x=58\)

f) \(95-\left(x+2\right)=45\)

\(x+2=95-45\)

\(x+2=50\)

\(x=50-2\)

\(x=48\)

a)

70 - (x - 3) = 45

x - 3 = 70 - 45 = 25

x = 25 + 3 = 28

Vậy x = 28

b)

12 + (5 + x) = 20

5 + x = 20 - 12 = 8

x = 8 - 5 = 3

Vậy x = 3

c)

130 - (100 + x) = 25

100 + x = 130 - 25 = 115

x = 115 - 100 = 15

Vậy x = 15

d)

175 + (30 - x) = 200

30 - x = 200 - 175 = 25

x = 30 - 25 = 5

Vậy x = 5

e)

(x + 12) + 22 = 92

x + 12 = 92 - 22 = 70

x = 70 - 12 = 58

Vậy x = 58

f)

95 - (x + 2) = 45

x + 2 = 95 - 45 = 50

x = 50 - 2 = 48

Vậy x = 48

câu c sai r kìa bạn

\(100+x=130-25\)

\(100+x=105\)

\(x=105-100\)

\(x=5\)

k cho mik nha bn

HT

TL :

x = 5

_HT_

<=> 30- x = 25

<= 30- 5 = 25

<= 5

moi nguoi hoc tot nhe

a,70-5(x-3)=45

       5(x-3) = 70 - 45

       5(x-3) = 25

          x-3   = 25 : 5

          x - 3 = 5

           x     = 5 + 3

             x   = 8.

b,12+(5+x)=20

         (5+x) = 20 - 12

        (5+x)  = 8

            x     = 8 - 5

            x     = 3

c,130-(100 + x)=25

           100 + x = 130 - 25

           100 + x = 105

                 x      = 105 - 100

                x       = 5 

Hok tốt !

a,70-5(x-3)=45

     5(x-3)  =70-45

     5(x-3)  =25

       (x-3)  =25:5

       x-3    =5

       x=5+3

       x=8

a,70-5(x-3)=45

   5(x-3)=70-45

   5(x-3)=25

   x-3=25:5

   x-3=5

      x=5+3

      x=8

Vậy x=8

b,12+(5+x)=20

   5+x=20-12

   5+x=8

       x=8-5

       x=3

Vậy x=3

c,130-(100 + x)=25

   100+x=130-25

   100+x=105

           x=105-100

           x=5

Vậy x=5

a) x +60+40 =400

   x             = 400-40-60

   x             =300

b) (x+25) + 50 = 100:2 +30

(x+25) +50     = 50+30=80

x+25             = 80-50=30

x                   =30-25

x                  = 5

a.x+60+40=200

x+100=200

x=200-100

x=100

b.x+25+50=100:2+30

x+75=50+30

x+75=80

x=80-75

x=5

mk nhanh nhất

a) x + 100 = 200

    x           = 200 - 100

    x           = 100

b) x + 25 + 50 = 50 + 30

    x + 75          = 80

    x                  = 80 - 75

    x                  = 5

a) 576 : x - 30 = 2

576 : x = 2 + 30

576 : x = 32

x = 576 : 32

x = 18

b) 180 - ( x - 45 ) : 2 = 120

( x - 45 ) : 2 = 180 - 120

( x - 45 ) : 2 = 60

x - 45 = 60 * 2

x - 45 = 120

x = 120 + 45

x = 165

a﴿ 576 : x ‐ 30 = 2

576 : x = 2 + 30

576 : x = 32

x = 576 : 32

x = 18

b﴿ 180 ‐ ﴾ x ‐ 45 ﴿ : 2 = 120

﴾ x ‐ 45 ﴿ : 2 = 180 ‐ 120

﴾ x ‐ 45 ﴿ : 2 = 60

x ‐ 45 = 60 * 2

x ‐ 45 = 120

x = 120 + 45

x = 165