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![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(x-5=-1\)
\(x=-1+5\)
\(x=4\)
b)
\(x+30=4\)
\(x=4-30\)
\(x=-26\)
c)
\(x-(-24)=3\)
\(x+24=3\)
\(x=3-24\)
\(x=-21\)
d)
\(22-(-x)=12\)
\(22+x=12\)
\(x=12-22\)
\(x=-10\)
e)
\(( x + 5 ) + ( x - 9 ) = x + 2\)
\(x+5+x-9=x+2\)
\(x+x-x=2+9-5\)
\(x=6\)
f)
\(( 27 - x ) + ( 15 + x ) = x - 24\)
\(27-x+15+x=x-24\)
\(-x+x-x=-24-15-27\)
\(-x=-66\)
\(x=66\)
x - 5 = -1 x - (-24) = 3
x = -1 + 5 x + 24 = 3
x = 4 x = 3 - 24
x + 30 = 4 x = - 21
x = 4 - 30 22 - ( -x) = 12
x = - 26 22 + x = 12
x + 5 + ( x - 9) = x + 2 x = 12 - 22
x + 5 + x - 9 = x + 2 x = -10
2x - x = 2 - 5 + 9 ( 27 - x) + ( 15 + x) = x - 24
x = - 3 + 9 27 - x + 15 + x = x - 24
x = 6 27 + 15 = x - 24
x - 24 = 42
x = 42 + 24
x = 66
![](https://rs.olm.vn/images/avt/0.png?1311)
(27-X)+(15+x)=x-24
27-x+15+x=x-24
-x+x-x=-24-27-15
-x=-66
x=-(-66)
x=66
a) x – 5 = - 1 ;
=> x = -1 + 5 = 4
Vậy x = 4
b) x + 30 = - 4;
=> x = - 4 - 30 = - 34
Vậy x = - 34
c) x – ( - 24) = 3 ;
=> x + 24 = 3
=> x = 3 - 24
=> x = - 21
Vậy x = - 21
d) 22 – ( - x ) = 12;
=> 24 + x = 12
=> x = 12
Vậy x = 12
e) ( x + 5 ) + ( x – 9 ) = x + 2 ;
=> x + 5 +x - 9 = x + 2
=> 2x - x = 1 + 9 - 5
=> x = 5
Vậy x = 5
f) ( 27 – x ) + ( 15 + x ) = x – 24 .
=> 27 - x + 15 + x = x - 24
=> x + 42 = x - 24
=> x - x = 42 - 24
=> 0 = 8 ( vô lí)
Vậy x thuộc rỗng
Rảnh nhỉ
@@ Học tốt
## Chiyuki Fujito
![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( x + 5 ) + ( x - 9 )= x + 2
x + 5 + x - 9 = x + 2
x + x - x = 2 - 5 + 9
x = 6
Vậy x = 6
b , ( 27 - x ) + (15 + x ) = x - 24
27 - x + 15 + x = x - 24
- x + x - x = - 24 - 27 - 15
- x = -66
x = 66
Vậy x = 66
a, x+5+x-9 bằng x+2
2x - 4 bằng x+2
2x - x bằng 2+4
x bằng 6
b, 27-x+15+x bằng x-24
42 bằng x-24
x bằng 42+24
x bằng 66
mọi ng kết bạn vs mk ik
cùng nhau học tập nào
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(x-5=-1\)
⇔\(x=4\)
b)\(x+30=-4\)
⇔\(x=-34\)
c)\(x-\left(-24\right)=3\)
⇔\(x+24=3\)
⇔\(x=-21\)
e)\(\left(x+5\right)+\left(x-9\right)=x+2\)
⇔\(x+5+x-9-x-2=0\)
⇔\(x-6=0\)
⇔\(x=6\)
f)\(\left(27-x\right)+\left(15+x\right)=x-24\)
⇔\(27-x+15+x-x+24=0\)
⇔\(66-x=0\)
⇔\(x=66\)
\(a.x-5=-1\) \(b.x+30=-4\)
\(x=\left(-1\right)+5\) \(x=\left(-4\right)-30\)
\(x=4\) \(x=-34\)
\(c.x-\left(-24\right)=3\) \(e.\left(x+5\right)+\left(x-9\right)=x+2\)
\(x=3+\left(-24\right)\) \(x+5+x-9=x+2\)
\(x=-21\) \(2x-4=x+2\)
\(2x-x=2+4\)
\(x=6\)
\(f.\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(27+15=x-24\)
\(42=x-24\)
\(x=24+42\)
\(x=66\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Ta có : \(x-5=-1\)
\(\Leftrightarrow x=\left(-1\right)+5\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
b, Ta có :\(x+30=-4\)
\(\Leftrightarrow\left(-4\right)-30\)
\(\Leftrightarrow x=\left(-34\right)\)
Vậy \(x=\left(-34\right)\)
c, Ta có : \(x-\left(-24\right)=3\)
\(x=3+\left(-24\right)\)
\(\Leftrightarrow x=\left(-21\right)\)
Vậy \(x=\left(-21\right)\)
d,Ta có : \(22-\left(-x\right)=12\)
\(\Leftrightarrow\left(-x\right)=22-12\)
\(\Leftrightarrow\left(-x\right)=10\)
Vậy ....
![](https://rs.olm.vn/images/avt/0.png?1311)
1 Tính tổng các số nguyên x sao cho
| x | < 17
\(\Rightarrow x\in\left\{\pm1;\pm2;\pm3;\pm4;\pm5;\pm6;\pm7;\pm8;\pm9;...;\pm16\right\}\)
\(Tổngx=0\)
2 Tìm số nguyên x biết
a . x - 5 = -1
\(x=-1+5\)
\(x=4\)
b . x - ( -24) = 3
\(x=3-24\)
\(x=-21\)
c . 15 - ( 4-x ) = 6
\(4-x=9\)
\(x=-5\)
d . (x-29)-(17-38 ) ( thiếu dữ liệu nhé )
e . (27-x )+(15+x)=x
\(27-x+15+x=x\)
\(-x+x-x=15-27\)
\(-x=-8\)
\(x=8\)
chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a)10-x=18-(27-9)
x=10-18-18
x=10
b)x-24=(-12)-15
x=-27+24
x=-3
c)25-(x-6)=-1
x-6=25-(-1)
x=26+6
x=32
![](https://rs.olm.vn/images/avt/0.png?1311)
a)( x+ 5)+(x-9)=x+2
x + 5 + x - 9 = x + 2
x + x - x = 2 -5 +9
x = 6
b)( 27 -x) +( 15+x )=x-24
-x + x - x = -24 -27 -15
-x = -66
x=66
hok tốt!
![](https://rs.olm.vn/images/avt/0.png?1311)
a. \(\left(x+5\right)+\left(x+9\right)=x+2\)
\(\Leftrightarrow\) \(x+5+x+9=x+2\)
\(\Leftrightarrow2x+14=x+2\)
\(\Leftrightarrow x=-12\)
b. \(\left(27-x\right)+\left(15+x\right)=x-24\)
\(\Leftrightarrow27-x+15+x=x-24\)
\(\Leftrightarrow x-24=42\)
\(\Leftrightarrow x=66\)
\(a,\left(x+5\right)+\left(x+9\right)=x+2\)
\(x+5+x+9=x+2\)
\(2x+14=x+2\)
\(2x+14-x-2=0\)
\(x+12=0\)
\(x=-12\)
\(b,\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(42=x-24\)
\(x=66\)
a) (x+5) + (x-9) = x+2
x+5 + x-9 = x+2
(x+x-x)=2-5+9
x=6
b) (27-x)+(15+x)=x-24
27-x+15+x=x-24
42= x-24
x= 42+ 24
x= 66
tick mik nha
a) (x+5) + (x-9) = x+2
x+5 + x-9 = x+2
(x+x-x)=2-5+9
x=6
b) (27-x)+(15+x)=x-24
27-x+15+x=x-24
42= x-24
x= 42+ 24
x= 66