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( x - 29 ) - ( 17 - 38 ) = - 9
x-29-17+38=-9
x=-9+29+17-38
x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
9. Tìm x biết
a x- ( 12- 15)= -8
<=> x - 12 + 15 = -8
<=> x + 3 = -8
<=> x = -11
Vậy x = -11
b. (x- 29 )- ( 17- 38)= -9
<=> x - 29 - 17 + 38 = -9
<=> x - 8 = -9
<=> x = -1
Vậy x = -1
a) x-12+15=-8
=>x=-8-15+12
=>x=-11
Vậy x=-11
b)x-29+21=-9
=>x=-9-21+29
=>x=-1
Vậy x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 15 - ( 4 - x ) = 6
⇒ 15 - 4 + x = 6
⇒ 11+ x = 6
⇒ x = -5
c, x - ( 12 - 25 ) = -8
⇒ x + 13 = -8
⇒ x = -21
d, ( x - 29 ) - ( 17 - 38 ) = -9
⇒ x - 29 + 21 = -9
⇒ x - 8 = -9
⇒ x = -1
b, - 30 + ( 25 - x ) = -1
⇒ - 30 + 25 - x = -1
⇒ -5 - x = -1
⇒ x = -4
a, \(15-4+x=6\) ⇒ \(11-x=6\) ⇒ \(x=5\)
b, \(-30+25-x=-1\) ⇒ \(-5-x=-1\) ⇒ \(x=-4\)
c, \(x-12+25=-8\Rightarrow x+13=-8\) ⇒ \(x=-21\)
d, \(x-29-17+38=-9\Rightarrow x-8=-9\Rightarrow x=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x-(12-25)=-8
<=> x+13=-8
<=> x=-21
b) (x-29)-(17-38)=-9
<=> x-29+21=-9
<=> x-8=-9
<=> x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
15-(4-x)=6
⇒15-4+x=6
⇒11+x=6
⇒x=-5
x-(12-25)=-8
⇒x+13=-8
⇒x=-21
(x-29)-(17-38)=-9
⇒x-29+21=-9
⇒x-8=-9
⇒x=-1
-30+(25-x)=-1
⇒-30+25-x=-1
⇒-5-x=-1
⇒x=-4
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1: =>x=8-35=-27
2: =>15-4+x=6
=>x+11=6
hay x=-5
3: =>-30+25-x=-1
=>x+5=1
hay x=-4
4: =>x-(-13)=-8
=>x+13=-8
hay x=-21
5: =>x-29-17+38=-9
=>x-8=-9
hay x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
( 36 + 79 ) + ( 145 - 79 - 36 )
= 115 + ( 66 - 36 )
= 115 + 30
= 145
10 - [ 12 - ( - 9 - 1 ) ]
= 10 - [ 12 - ( - 10 ) ]
= 10 - 22
= - 12
( 38 - 29 + 43 ) - ( 43 + 38 )
= ( 9 + 43 ) - 81
= 52 - 81
= - 29
271 - [ ( 43 ) + 271 - ( - 17 ) ]
= 271 - [ 314 - ( - 17 ) ]
= 271 - 331
= - 60
- 144 - [ 29 - ( + 144 ) - ( + 144 ) ]
= - 144 - [ ( - 115 ) - ( + 144 ) ]
= - 144 - ( - 259 )
= 115
(36+79)+(145-79-36)
=115+30
=145
10-[12-(-9-1)]
=10-22
=-12
(38-29+43)-(43+38)
=52-81
=(-29)
271-[(43)+271-(17)]
=271-297
=(-26)
-144-[29-(+144)-(+144)
=-144-(-259)
=115
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 15 – ( 4 – x) = 6
=> 4 – x= 15 - 6
=> 4 – x= 9
=> x= 4 - 9
=> x= -5
Easy!
a) \(15-\left(4-x\right)=6\)
\(\Leftrightarrow4-x=15-6\)
\(\Leftrightarrow4-x=9\)
\(\Leftrightarrow x=4-9\)
\(\Leftrightarrow x=-5\)
Vậy \(x=-5\)
b) \(-30+\left(25-x\right)=-1\)
\(\Leftrightarrow\left(25-x\right)=-1-\left(-30\right)\)
\(\Leftrightarrow25-x=29\)
\(\Leftrightarrow x=25-29\)
\(\Leftrightarrow x=-4\)
c) \(x-\left(12-25\right)=-8\)
\(\Leftrightarrow x-\left(-13\right)=-8\)
\(\Leftrightarrow x=-8+-13\)
\(\Leftrightarrow x=-21\)
Vậy \(x=-21\)
d) \(\left(x-29\right)-\left(17-38\right)=-9\)
\(\Leftrightarrow\left(x-29\right)-\left(-21\right)=-9\)
\(\Leftrightarrow x-29=-9+\left(-21\right)\)
\(\Leftrightarrow x-29=-30\)
\(\Leftrightarrow x=-30+29\)
\(\Leftrightarrow x=-1\)
Vậy \(x=-1\)
PT \(\Leftrightarrow x-29-17+38=-9\)
\(\Leftrightarrow x=-9-38+17+29=-1\)
Vậy ...