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
a) 12 + ( 5 + x ) = 20
=> 5 + x = 20 -12
=> 5 + x = 8
=> x = 8-5
=> 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) 3 ( x + 23 ) + 6 = 96
=> 3 ( x + 23 ) = 96 - 6
=> 3 ( x + 23 ) = 90
=>x + 23 = 90 : 3
=> x + 23 = 30
=> x = 30 -23
=> x = 7
e) 145 - ( 125 + x ) = 12
=> 125 + x = 145 - 12
=> 125 + x = 133
=> x = 133 - 125
=> x = 8
j) 5 ( x + 12 ) + 22 = 92
=> x + 12 = 92 - 22 - 5
=> x + 12 = 65
=> x = 65 - 12
=> x = 53
g) 3 ( x + 23 ) + 6 = 96
=> x + 23 = 96 - 6 - 3
=> x + 23 = 77
=> x = 77 - 23
=> x = 54
\(a,12+\left(5+x\right)=20\)
\(5+x=20-12\)
\(5+x=8\)
\(x=8-5\)
\(x=3\)
\(b,120+\left(50+x\right)=180\)
\(50+x=180-120\)
\(50+x=60\)
\(x=60-50\)
\(x=10\)
\(c,175+\left(30-x\right)=200\)
\(30-x=200-175\)
\(30-x=25\)
\(x=30-25\)
\(x=5\)
\(d,130-\left(100+x\right)=25\)
\(100+x=130-25\)
\(100+x=105\)
\(x=105-100\)
\(x=5\)
\(e,145-\left(125+x\right)=12\)
\(125+x=145-12\)
\(125+x=133\)
\(x=133-125\)
\(x=8\)
\(j,5\left(x+12\right)+22=92\)
\(5\left(x+12\right)=92-22\)
\(5\left(x+12\right)=70\)
\(x+12=70:5\)
\(x+12=14\)
\(x=14-12\)
\(x=2\)
\(g,3\left(x+23\right)+6=96\)
\(3\left(x+23\right)=96-6\)
\(3\left(x+23\right)=90\)
\(x+23=90:3\)
\(x+23=30\)
\(x=30-23\)
\(x=7\)
Chúc bạn học tốt !
12+(5+x)=20 120+(50+x)=180 175+(30-x)=200 130-(100+x)=25 145-(125+x)=12
5+x=20-12 50+x=180-120 30-x=200-175 100+x=130-25 125+x=145-12
5+x=8 50+x=60 30-x=25 100+x=105 125+x=133
x=8-5 x=60-50 x=30-25 x=105-100 x=125+133
x=3 x=10 x=5 x=5 x=258
5(x+12)+22=92 3(x+23)+6=96
5(x+12)=92-22 3(x+23)=96-6
5(x+12)=70 3(x+23)=90
x+12=70:5 x+23=90:3
x+12=14 x+23=30
x=14-12 x=30-23
x=2 x=7
cảm ơn mn rất nhiều
a) 12 + ( 5 + x ) = 20
5 + x = 20 - 12
5 + x = 8
x = 8 - 5
x = 3
vậy x = 3
b) 120 + ( 50 + x ) = 180
50 + x = 180 - 120
50 + x = 60
x = 60 - 50
x = 10
vậy x = 10
c) 175 + ( 30 - x ) = 200
30 - x = 200 - 175
30 - x = 25
x = 30 - 25
x = 5
vậy x = 5
d) 130 - ( 100 + x ) = 25
100 + x = 130 - 25
100 + x = 105
x = 105 - 100
x = 5
vậy x = 5
e) 145 - ( 125 + x ) = 12
125 + x = 145 - 12
125 + x = 133
x = 133 - 125
x = 8
vậy 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
vậy x = 2
g) 3 . ( x + 23 ) + 6 = 96
3 . ( x + 23 ) = 96 - 6
3 . ( x + 23 ) = 90
x + 23 = 90 : 3
x + 23 = 30
x = 30 - 23
x = 7
vậy x = 7
a, 12 + ( 5 + x )= 20
5 + x = 20 - 12
5 + x = 8
x = 8 - 5
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 = 25 - 30
- x = - 5
x = 5