Giúp mình với nha !
1 tìm x
a , 231 - (x-6 ) =1339:13
b, 4 x -7 =3 .( 1568 - 3x ) - 2566
c, 294 = 6 .( x +15 )
d , 936 - ( 4x + 24 ) =72
231-(x-6)=1339:13
70-5.(2x-3)=45
156-(x+61)=82
6.(5x+35)=330
936-(4x+24)=72
a, \(231-\left(x-6\right)=1339:13\)
\(\Leftrightarrow231-\left(x-6\right)=103\)
\(\Leftrightarrow x-6=128\)
\(\Leftrightarrow x=134\)
Vậy .....
b, \(70-5\left(2x-3\right)=45\)
\(\Leftrightarrow5\left(2x-3\right)=25\)
\(\Leftrightarrow2x-3=5\)
\(\Leftrightarrow2x=8\)
\(\Leftrightarrow x=4\)
Vậy ....
c, \(156-\left(x+61\right)=82\)
\(\Leftrightarrow x+61=74\)
\(\Leftrightarrow x=13\)
Vậy ....
d, \(6\left(5x+35\right)=330\)
\(\Leftrightarrow5x+35=55\)
\(\Leftrightarrow5x=20\)
\(\Leftrightarrow x=4\)
Vậy ......
e, \(936-\left(4x+24\right)=72\)
\(\Leftrightarrow4x+24=864\)
\(\Leftrightarrow4x=840\)
\(\Leftrightarrow x=210\)
Vậy ...
231-(x-6)=1339:13
237-x=103
=>x=237-103=134
Vậy x=134
70-5(2x-3)=45
70-10x+15=45
=>-10x=45-15-70=-40
=>x=4
Vậy x=4
Các caau sau tương tự nhé bn
a, 231 - ( x - 6 ) = 1339 : 13
231 - ( x -6 ) = 103
x - 6 = 231 - 103 = 128
x = 128 + 6 = 134
b, 70 - 5 (2x -3 ) = 45
5 ( 2x -3 ) = 70 - 45 = 25
( 2x -3 ) = 25 : 5 = 5
2x = 5 + 3 = 8
x = 8 : 2 = 4
c, 156 - ( x + 61 ) = 82
x + 61 = 156 - 82 =74
x = 74 - 61
x = 13
d, 6 ( 5x + 35 ) = 330
5x + 35 = 330 : 6 = 55
5x = 55 - 35 = 20
x = 20 : 5 = 4
e, 936-(4x+ 24 ) = 72
4x + 24 = 936 - 72 = 864
4x = 864 - 24 = 840
x = 840 : 4 = 210
Chuc ban hoc tot nhe
bài 13: tìm x biết
a. 124 + (118 - x) = 217
b. 156- (x + 61) = 82
c. 219 - 7(x + 1) = 100
d. (3x - 6). 3 = 3^4
e. 231 - (x - 6) = 1339 : 13
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6).3 = 3⁴
3x - 6 = 3⁴ : 3
3x - 6 = 3³
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
x - 6 = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6) . 3 = 34
(3x - 6) . 3 = 81
(3x - 6) = 81 : 3
(3x - 6) = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
(x - 6) = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
cô cấm dùng máy tính -)
lớp 9 ms đc dùng:_)
Bài 6: Tìm X biết :
a) X : [(1800+600) :30] = 560 : (315-35)
b) [(250-50) : 15] : X = (450-60) :130
c) (158- X) : 7 = 20
d) 231-(X - 6) = 1339:13
e) 70-5 (2xX-3) = 45
f)156 - (x +61) = 82
g) 6x(5xX+35) = 330
h) 936 - (4xX +24) =72
a) => x : 80 = 2
=> x = 160
b) => 200/15 : x = 3
=> x = 40/9
c) => 158 - x = 140
=> x = 18
d) => 231 - (x-6) = 103
=> x - 6 = 128
=> x = 134
4x-7=3.(1568-3x)-2566
Tìm x:
=> 4x - 7 = 4704 - 9x - 2566
=> 13x = 2145
=> x = 165
mik cần các bạn giúp gấp mai mik phải nộp rồi :
a ) 96 -3 x (x +1 ) =42
b) 231 -(x-6)= 1339:13
c) [ ( 6 * x-72 ) : 2 -84 ] * 8 =2640
Tìm X
a) 0,12 x X - 2 = 4
b) 231 - ( X - 6 ) = 1339 : 13
c) 7,99 x X + X x 2 + X : 100 = 7,9
d) ( 14 - X : 6 ) x 7 = 84
a)0,12.X-2=4
=>0,12.X=4+2
=>0,12.X=6
=>X=6:0,12
=>X=50
b)231-(X-6)=1339:13
=>231-(X-6)=103
=>X-6=231-103
=>X-6=128
=>X=128+6
=>X=134
c)7,99.X+X.2+X:100=7,9
=>X.(7,99+2+1/100)=7,9
=>X.10=7,9
=>X=7,9:10
=>X=0,79
d)(14-X:6).7=84
=>14-X:6=84:7
=>14-X:6=12
=>X:6=14-12
=>X:6=2
=>X=2.6
=>X=12
tim x thuoc N biet
a,3x:11=0
b,231-(x-6)=1339:13
c,x.(x-15)=0
d,(x-1).(x-20)=0
e,25:x=x (x khac 0)
f,2782:[216-(x-3) ]=13
1.Tim x,biết
a)2.x-138=23.32
b)231-(x-6)=1339÷13
c)[(6.x-72)÷2-84].28=5628
\(a.2.x-138=2^3.3^2\)
\(2.x-138=8.9\)
\(2.x-138=72\)
\(2.x\) \(=72+138\)
\(2.x\) \(=210\)
\(x\) \(=210:2\)
\(x\) \(=105\)
\(b.231-\left(x-6\right)=1339:13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x\) \(=128+6\)
\(x\) \(=134\)
\(c.\left[\left(6.x-72\right):2-84\right].28=5628\)
\(\left[\left(6.x-72\right):2-84\right]\) \(=5628:28\)
\(\left(6.x-72\right):2-84\) \(=201\)
\(\left(6.x-72\right):2\) \(=201-84\)
\(\left(6.x-72\right):2\) \(=117\)
\(6.x-72\) \(=117.2\)
\(6.x-72\) \(=234\)
\(6.x\) \(=234+72\)
\(6.x\) \(=306\)
\(x\) \(=306:6\)
\(x\) \(=51\)
mik nè
Tìm số tự nhiên x biết :
a) 231 - (x - 6) = 1339 : 13
b) x + 5 .2 - (32 + 16 . 3 : 6 - 15) = 0
Ai giải đúng và nhanh mik tick cho nha !
a)231-(x-6)=103
x-6=231-103=128
x=128+6=134
b)x+10-25=0
x+10=0+25=25
x=25-10=15