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a) \(70-5\left(2x-3\right)=45\)
\(70-10x+15=45\)
\(-10x=45-70-15\)
\(-10x=-40\)
\(x=4\)
vay \(x=4\)
b) \(156-\left(x+61\right)=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
vay \(x=13\)
c) \(6\left(5x+35\right)=330\)
\(30x+210=330\)
\(30x=330-210\)
\(30x=120\)
\(x=4\)
vay \(x=4\)
d) \(936-\left(4x+24\right)=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=210\)
vay \(x=210\)
\(70-5.\left(2x-3\right)\)\(=45\)
\(5.\left(2x-3\right)\)\(=\)\(70-45\)
\(5.\left(2x-3\right)\)\(=25\)
\(2x-3=25:5\)
\(2x-3=5\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
\(156-\left(x+61\right)\)\(=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
\(6.\left(5x+35\right)\)\(=330\)
\(5x+35=330:6\)
\(5x+35=55\)
\(5x=55-35\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
\(936-\left(4x+24\right)\)\(=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=840:4\)
\(x=210\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 70 - 5 ( 2x-3 ) = 45
5( 2x-3 ) = 25
2x - 3 = 25 : 5
2x - 3 = 5
2x = 8
x = 8 : 2
x = 4
b) 6 ( 5x + 35 ) = 330
5x + 35 = 330 : 6
5x + 35 = 55
5x = 55 - 35
5x = 20
x = 20 : 5
x = 4
c) 936 - ( 4x + 24 ) = 72
4x + 24 = 936 - 72
4x + 24 = 864
4x = 864 - 24
4x = 840
x = 840 : 4
x = 210
d) 5( 3x + 34 ) = 515
3x + 34 = 515 : 5
3x + 34 = 103
3x = 103 - 34
3x = 69
x = 69 : 3
x = 23
\(a,70-5\left(2x-3\right)=45\)
\(\Leftrightarrow10x-15=70-45\)
\(\Leftrightarrow10x=25+15\)
\(\Leftrightarrow x=\frac{40}{10}=4\)
Vậy x=4
\(b,6\left(5x+35\right)=330\)
\(\Leftrightarrow5x+35=55\)
\(\Leftrightarrow5x=20\)
\(\Leftrightarrow x=4\)
vậy x=4
\(c,936-\left(4x+24\right)=72\)
\(\Leftrightarrow4x+24=936-72\)
\(\Leftrightarrow4x=864-24\)
\(\Leftrightarrow x=840:4=210\)
Vậy x=210
\(d,5\left(3x+34\right)=515\)
\(\Leftrightarrow3x+34=515:5\)
\(\Leftrightarrow3x=103-34\)
\(\Leftrightarrow x=69:3=23\)
Vậy x=23
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm :
a) 936 - ( x + 24 ) = 72
x + 24 = 936 - 72
x + 24 = 864
x = 840
b) 1635 - ( x - 39 ) = 482
x - 39 = 1635 - 482
x - 39 = 1153
x = 1192
c) 2750 - ( 85 - x ) = 2670
85 - x = 2750 - 2670
85 - x = 80
x = 5
Học tốt nhé
936-(x+24)=72 => (x+24)=936-72 =>(x+24)=864 =>x=864-24 =>x=840
vậy x=840
1635-(x-39)=482 =>(x-39)=1635-482=>(x-39)=1153=>x=1153+39=>x=1192
vậy x=1192
2750-(85-x)=2670=>(85-x)=2750-2670=>(85-x)=80=>x=85-80=>x=5
vậy x=5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(936-\left(4.x+24\right)=72\)
\(4.x+24=72+936\)
\(4.x+24=1008\)
\(4.x=1008-24\)
\(4.x=984\)
\(x=984:4\)
\(x=246\)
936-(4x+24)=72
4x+24=936-72
4x+24=864
4x=864-24
4x=840
x=840:4
x=210
![](https://rs.olm.vn/images/avt/0.png?1311)
\(936-\left(4x+5x\right)=900\\ 936-9x=900\\ 9x=36\\ x=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
936 - ( x + 24 ) = 72
936 - x - 24 = 72
912 - x=72
x=840
5 . (x + 35 ) = 515
x+35=515:5
x+35=103
x=68
(158 - x ) :7 = 20
158 - x=20x7
158 - x=140
x=18
936-(x+24)=72
X+24=936-72
X+24=864
X=864-24
X=840
5.(x+35)=515
X+35=515:5
X+35=103
X=103-35
X=68
(158-x):7=20
158-x=20.7
158-x=140
X=158-140=18
K biết đúng hay sai hì hì, mong thông cảm ạ*cúi đầu*
72 – (4x + 24) = 936
4x+24=936-72
4x+24=864
4x =864-24
4x = 840
x = 840:4
x = 210.
Vậy x=210.
4x + 24 = 72 - 936
4x + 24 = -864
4x = -864 - 24
4x = -888
x = -888 : 4
x = -222