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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
a)=2
b)=0.3333333333
c)=9
d)= chua tinh
e)=33
g)=5
tk minh nha ban nha
a) (2x-5)+17=16
2x-5=16-17
2x-5=-1
2x=-1+5
2x=4
x=4:2
x=2
b) 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
( 2x - 5 ) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = - 11
2x = - 11 + 5
2x = -6
x = - 6 : 2
x = -3
Vậy x = - 3
10 - 2 ( 4 - 3 x ) = - 4
2 ( 4 - 3 x ) = 10 - ( - 4 )
2 ( 4 - 3 x ) = 14
4 - 3x = 14 :2
4 - 3x = 7
3x = 4 - 7
3x = -3
x = -3 : 3
x = 1
Vậy x = 1
1) 3x = 45 + 15 = 60
x = 60 : 3 = 20
2) 5x = 50 - 35 = 15
x = 15 : 5 = 3
3) (2x - 5) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2 = -3
4) 10 - 2(4 -3x) = -4
2(4 - 3x) = -4 - 10 = -14
4 - 3x = -14 : 2 = -7
3x = -7 - 4 = -18
x = -18 : 3 = -6
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
1) -16 + 23 + x = - 16
ó x = -23
2) 2x – 35 = 15
ó 2x = 50
ó x = 25
3) 3x + 17 = 12
ó 3x = -5
ó x = -5/3
4) │x - 1│= 0
=> x – 1 = 0 ó x = 1
5) -13 .│x│ = -26
ó |x| = 2
ó x = 2 hoặc x = -2
1,Ta có :\(\left(-16\right)+23+x=\left(-16\right)\)
\(\Leftrightarrow23+x=\left(-16\right)-\left(-16\right)\)
\(\Leftrightarrow23+x=\left(-16\right)+16\)
\(\Leftrightarrow\) \(23+x=0\)
\(\Leftrightarrow x=0-23\)
\(\Leftrightarrow x=-23\)
Vậy \(x=-23\)
2,Ta có : \(2.x-35=15\)
\(\Leftrightarrow\) \(2.x=15+35\)
\(\Leftrightarrow2.x=50\)
\(\Leftrightarrow x=50:2\)
\(\Leftrightarrow x=25\)
Vậy \(x=25\)
1) - 16 + 23 + x = - 16
=> 23 + x = - 16 - 16
=> 23 + x = 0
=> x = 0 - 23
=> x = - 23
Vậy x = - 23
2) 2x - 35 = 15
=> 2x = 15 + 35
=> 2x = 50
=> x = 50 : 2
=> x = 25
Vậy x = 25
3) 3x + 17 = 12
=> 3x = 12 - 17
=> 3x = -5
=> x = - 5 : 3
=> x = 5/3
Vậy 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
Vậy x = - 3
5) 10 - 2( 4 - 3x ) = - 4
=> 2( 4 - 3x ) = - 4
=> 4 - 3x = - 4 : 2
=> 4 - 3x = - 2
=> 3x = 4 - ( - 2 )
=> 3x = 6
=> x = 6 :3
=> x = 2
Vậy x = 2
6) - 12 + 3( - x + 7 ) = - 18
=> - 12 + 3( 7 - x ) = - 18
=> 3( 7 - x ) = -18 + - 12
=> 3( 7 - x ) = - 6
=> ( 7 - x ) = - 6 : 3
=> 7 - x = - 2
=> - x = - 2 - 7
=> - x = - 9
=> x = 9
Vậy x = 9
Chúc bạn học tốt!