Tìm số nguyên x biết
a)|x|.=18 b)2x+17=3
c)-5<x<3 d|x|=|-7|
e)5-(-7)=x+7
Tìm các số nguyên x, biết:
a) (2x - 5) + 17 = 6
b) (-18) . x = -36
c) 15 - (-11x - 7) = -22
a, (2\(x\) -5) + 17 = 6
2\(x\) - 5 = 6 - 17
2\(x\) - 5 = - 11
2\(x\) = - 11 + 5
2\(x\) = -6
\(x\) = -3
b, (-18).\(x\) = - 36
\(x\) = -36 : (-18)
\(x\) = 2
c, 15 - (-11\(x\) - 7) = -22
- 11\(x\) - 7 = 15 + 22
-11\(x\) - 7 = 37
11\(x\) = -37 - 7
11\(x\) = - 44
\(x\) = - 4
a) \(\left(2x-5\right)+17=6\Rightarrow2x-5=-11\Rightarrow2x=-6\Rightarrow x=-3\)
b) \(\left(-18\right)x=-36\Rightarrow x=\left(-36\right):\left(-18\right)=2\)
c) \(15-\left(-11x-7\right)=-22\)
\(\Rightarrow15+11x+7=-22\)
\(\Rightarrow11x=-22-7-15\)
\(\Rightarrow11x=-44\)
\(\Rightarrow x=-44:11=-4\)
a) (2x - 5) + 17 = 6
(2x - 5) = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2
x = -3 Vậy x = -3
b) (-18) . x = -36
x = -36 : (-18)
x = 2 Vậy x = 2
c) 15 - (-11x - 7) = -22
(-11x - 7) = 15 - (-22)
(-11x - 7) = 37
-11x - 7 = 37
-11x = 37 + 7
-11x = 44
x = 44 : (-11)
x = -4 Vậy x = -4
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Tìm các số nguyên x, biết:
a) 7x . ( x - 10 ) = 0
b) 17 . ( 3x - 6 ) . ( 2x - 18 ) =0
c) ( 4 - 2x ) . ( x - 3 ) = 0
d) - x . ( x + 7 ) . ( x - 4 ) = 0
a, 7\(x\).(\(x\) - 10) = 0
\(\left[{}\begin{matrix}7x=0\\x-10=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=0\\x=10\end{matrix}\right.\)
Vậy \(x\in\) {0; 10}
b, 17.(3\(x\) - 6).(2\(x\) - 18) = 0
\(\left[{}\begin{matrix}3x-6=0\\2x-18=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}3x=6\\2x-18=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=6:3\\x=18:2\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=2\\x=9\end{matrix}\right.\)
c, (4 - 2\(x\)).(\(x\) - 3) = 0
\(\left[{}\begin{matrix}4-2x=0\\x-3=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}2x=4\\x=3\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=4:2\\x=3\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=2\\x=3\end{matrix}\right.\)
Vậy \(x\in\) {2; 3}
Tìm số nguyên x, biết:
a) 2.x + 1 = 3
b) (2x - 5) + 17 = 6
c) 10 - 2. (4 - 3x) = -4
a) 2x + 1 = 3
2x = 2
x = 1
b) ( 2x - 5 ) + 17 = 6
( 2x - 5 ) = 6 - 17
( 2x - 5 ) = -11
2x = -11 + 5
2x = -6
x = -3
c) 10 - 2 x ( 4 - 3x ) = -4
2 x ( 4 - 3x ) = 14
4 - 3x = 7
3x = -3
x = -1
a) 2x + 1 = 3
2x = 3-1
2x=2
x=2:2
x=1
b) ( 2x - 5 ) + 17 = 6
( 2x - 5 ) = 6 - 17
( 2x - 5 ) = -11
2x = -11 + 5
2x = -6
x=-6:2
x = -3
Tìm số nguyên x, biết:
a) 2 x + 12 = − 32.
b) − 3 x − 23 = − 17.
c) 2 ( x − 3 ) + ( − 6 ) = − 24.
d) x − 12 = − 5.
Bài 2:Tìm các số nguyên x biết:
a) -(x+84)+213=-16
b) x+(-35)=18
c) -2x-(-17)=15
a, - ( x + 84 ) + 213 = -16
=> - ( x + 84 ) = -16 - 213
=> - ( x + 84 ) =-229
=> x + 84 = 229
=> x = 145
b. x + ( -35 ) = 18
=> x = 18 - ( -35 )
=> x = 18 + 35
=> x = 53
c. -2x - ( - 17 ) = 15
=> -2x = 15 + ( -17)
=> -2x = -2
=> x = 1
\(a,-\left(x+84\right)+213=-16\)
\(x+84=213+16\)
\(x+84=229\)
\(x=229-84\)
\(x=145\)
\(b,x+\left(-35\right)=18\)
\(x=18+35\)
\(x=53\)
\(c,-2x-\left(-17\right)=15\)
\(-2x+17=15\)
\(2x=17-15\)
\(2x=2\)
\(x=1\)
Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
2) 2x – 35 = 15
3) 3x + 17 = 12
4) (2x – 5) + 17 = 6
5) 10 – 2(4 – 3x) = -4
6) - 12 + 3(-x + 7) = -18
Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
7+x=-16
x=-16-7
x=-23
2) 2x – 35 = 15
2x=15+35
2x=50
x=50:2
x=25
3) 3x + 17 = 12
3x=12-17
3x=-5
x=-5/3
4) (2x – 5) + 17 = 6
2x-5=6-17
2x-5=-11
2x=-11+5
2x=-6
x=-6:2
x=-3
5) 10 – 2(4 – 3x) = -4
2(4-3x)=10-(-4)
2(4-3x)=14
4-3x=14:2
4-3x=7
3x=4-7
3x=-3
x=-3:3
x=-1
6) - 12 + 3(-x + 7) = -18
3(-x+7)=-18-(-12)
3(x+7)=-6
x+7=-6:3
x+7=-2
x=-2-7
x=-9
tự đi mà làm
tìm số nguyên x, biết
a,-(-x + 13 - 142 ) + 18 = 55
b, 25 - 3.(6 - x ) = 22
c, [( 2x - 11) : 3 + 1].5 = 20
d,3( x + 5 ) - x - 11 = 24
-( -x + 13 - 142 ) + 18 = 55
-( -x - 129) + 18 = 55
x + 129 + 18 = 55
x + 147 = 55
x = 55 - 147
x = -92
b, 25 - 3.(6 -x ) = 22
3(6-x) = 25 - 22
3(6-x) = 3
6 - x = 1
x =5
c, [ ( 2x - 11 ) :3 +1] .5 = 20
( 2x - 11) : 3 + 1 = 20 : 5
(2x - 11) : 3 + 1 = 4
( 2x - 11) : 3 = 4 - 1
(2x - 11 ) : 3 = 3
2x - 11 = 3 x 3
2x - 11 = 9
2x = 9 + 11
2x = 20
x = 10
d, 3(x+5) - x - 11 = 24
3(x+5) - x = 24 +11
3x + 15 - x = 35
2x = 35 - 15
2x = 20
x = 10
Bài 6: Tìm số nguyên x,biết:
a) x+ 118 =218 |
b) 18 – x =-17 |
c) (-18) – x =-17 |
d)124 +(118 – x)=217 |
e) (3x – 6).3 = 34 |
g) 23.(42 – x) = 46 |
h) 84 – (3x + 8) = 34 |
i) 3(2x + 1) -19 = 14 |
k) 6x – 302 = 23.5 |
m) (x -1)2 = 81 |
n) 2x+1- 5 =27 |
m) 2x+ 2x+1+ 2x+2 = 56 |
a) x + 118 = 218
x = 218 – 118
x = 100
b) 18 – x = -17
X = 18 – (-17)
X = 35
c) (-18) – x = -17
X = (-18) – (-17)
X = -1
d)124 + (118 – x) = 217
118 – x = 93
X = 118 – 93
X = 25
e) (3x – 6).3 = 34
(3x – 6).3 = 81
3x – 6 = 27
3x = 33
ð X = 11
g) 23.(42 – x) = 46
42 – x = 2
ð X = 40
h) 84 – (3x + 8) = 34
3x + 8 = 84 – 34
3x + 8 = 50
3x = 50 – 8
3x = 42
X = 42 : 3
ð X = 14
i) 3.(2x + 1) – 19 = 14
3.(2x + 1) = 14 + 19
3.(2x + 1) = 33
2x + 1 = 33 : 3
2x + 1 = 11
2x = 11 – 1
2x = 10
X = 10 : 2
ð X = 5
k) 6x – 302 = 23.5
6x – 302 = 40
6x = 40 + 302
6x = 342
X = 342 : 6
ð X = 57
m) (x – 1)2 = 81
(x – 1)2 = 92
ð X – 1 = 9
ð X = 9 + 1
ð X = 10
n) 2x+1 – 5 = 27
2x+1 = 27 + 5
2x+1 = 32
2x+1 = 25
ð X = 4
a) \(x+118=218\)
\(x=218-118\)
\(x=100\)
b)\(18-x=-17\)
\(-x=-18-17\)
\(-x=-35\)
\(x=35\)
c)\(\left(-18\right)-x=-17\)
\(-x=18-17\)
\(-x=1\)
\(x=-1\)
d)\(124+\left(118-x\right)=217\)
\(118-x=217-124\)
\(118-x=93\)
\(x=25\)
e) \(\left(3x-6\right).3=3^4\)
\(3x-6=3^3\)
\(3x-6=27\)
\(x=11\)
g)\(23.\left(42-x\right)=46\)
\(42-x=2\)
\(x=40\)
h) \(84-\left(3x+8\right)=34\)
\(3x+8=50\)
\(x=14\)
i) \(3\left(2x+1\right)-19=14\)
\(3\left(2x+1\right)=33\)
\(2x+1=11\)
\(x=5\)
k) \(6x-302=2^3.5\)
\(6x-302=8.5\)
\(x=57\)
m) \(\left(x-1\right)^2=81\)
\(\left(x-1\right)^2=9^2\)
\(x-1=9\)
\(x=10\)
n) \(2^{x+1}-5=27\)
\(2^{x+1}=32\)
\(2^{x+1}=2^5\)
\(x+1=5\)
\(x=4\)
m) \(2^x+2^{x+1}+2^{x+2}=56\)
\(2^x.1+2^x.2+2^x.2^2=56\)
\(2^x\left(1+2+4\right)=56\)
\(2^x=8\)
\(2^x=2^3\)
\(x=3\)
\(2^x=8\)
Tìm các số nguyên x biết
a) x+(-35)=18
b) -2x-(-17)=15
a) x+(-35)=18
x-35=18
x=18+35
x=53
vậy x=53
b) -2x-(-17)=15
-2x+17=15
-2x=15-17
-2x=-2
x=-2:(-2)
x=1
vậy x=1
x+(-35)=18
x=18-(-35)
x=-17
1/ Tìm số nguyên x
a) 2.x -18 = 10
b) 3.x + 26 = 5
c) I x-2 I = 0
2/ Tính hợp lí
a ) 18 .17 -3 .6.7
b) 54-6 (17 + 9)
c) 33. (17-5) -17 .(33-5)