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a, (2x - 5) + 17 = 6
=> 2x - 5 + 17 = 6
=> 2x = 6 - 17 + 5
=> 2x = -6
=> x = -3
vậy_
a, (2x - 5) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2 = -3
b) -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
x = 9
\(a,\left(2x-5\right)+17=6\)
\(2x-5=6-17\)
\(2x-5=-11\)
\(2x=-11+5\)
\(2x=-6\)
\(x=-3\)
\(b,10-2.\left(4-3x\right)=-4\)
\(2.\left(4-3x\right)=10+4\)
\(2.\left(4-3x\right)=14\)
\(4-3x=14:2\)
\(4-3x=7\)
\(-3x=7-4\)
\(-3x=3\)
\(x=-1\)
\(c,-12+3.\left(-x+7\right)=18\)
\(3.\left(-x+7\right)=18+12\)
\(3.\left(-x+7\right)=30\)
\(-x+7=30:3\)
\(-x+7=10\)
\(x=7-10\)
\(x=-3\)
\(d,24:\left(3x-2x\right)=-3\)
\(24:x=-3\)
\(x=24:\left(-3\right)\)
\(x=-8\)
\(e,-45:5.\left(-3-2x\right)=3\)
\(-9.\left(-3-2x\right)=3\)
\(27+18x=3\)
\(18x=3-27\)
\(18x=-24\)\
\(x=-\frac{4}{3}\)
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) 10 - 2( 4 - 3x ) = - 4
2 ( 4 - 3x ) = 10 - ( -4 )
2 ( 4 -3x ) = 10 + 4 = 14
4 - 3x = 14 : 2 = 7
3x = 4 - 7 = -3
x = -3 : 3
x = - 1
Vậy x = - 1
c ) - 12 + 3 ( - x + 7 ) = - 18
3 ( - x + 7 ) = - 18 - ( - 12 )
3 ( - x + 7) = - 18 + 12 = - 6
( - x + 7 ) = - 6 : 3
- x + 7 = - 2
- x = - 2 - 7
- x = - 9
=> x = 9
Vậy x = 9
d) 24 : ( 3x - 2 ) = - 3
3x - 2 = 24 : ( - 3 )
3x - 2 = - 8
3x = - 8 + 2
3x = - 6
x = - 6 : 3
x = - 2
Vậy x = - 2
e ) - 45 : [ 5 . ( - 3 - 2x )] = 3 ( câu này bạn viết thiếu đe nha , làm mình tính mãi không ra )
5 . ( - 3 - 2x ) = - 45 : 3
5 . ( -3 - 2x ) = - 15
- 3 - 2x = - 15 : 5
- 3 - 2x = - 3
2x = - 3 - ( - 3 )
2x = - 3 + 3
2x = 0
=> x = 0
Vậy x = 0
aaloskzjjskwnsnndnajabbdjrbevvdvxujsbskxkkdjdjjdjjsjshsjdjdbdbbdbdbxbfbA
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
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
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
1)\(10-2\left(4-3x\right)=-4\)
\(\Rightarrow2\left(4-3x\right)=10-\left(-4\right)\)
\(\Rightarrow2\left(4-3x\right)=14\)
\(\Rightarrow4-3x=7\)
\(\Rightarrow3x=-3\)
\(\Rightarrow x=-1\)
Vậy x=-1
2)????
3)\(24:\left(3x-2\right)=-3\)
\(\Rightarrow3x-2=-8\)
\(\Rightarrow3x=-6\)
\(\Rightarrow x=-2\)
Vậy x=-2
4)\(-45:5\left(-3-2x\right)=3\)
\(\Rightarrow5\left(-3-2x\right)=-15\)
\(\Rightarrow-3-2x=-3\)
\(\Rightarrow2x=0\)
\(\Rightarrow x=0\)
Vậy x=0
_Học tốt_
1 ) \(\left(2x-5\right)+17=6\)
\(\Leftrightarrow2x-5=-11\)
\(\Leftrightarrow2x=-6\)
\(\Leftrightarrow x=-3\)
Vậy \(x=-3.\)
2 ) \(10-2\left(4-3x\right)=-4\)
\(\Leftrightarrow2+6x=-4\)
\(\Leftrightarrow6x=-6\)
\(\Leftrightarrow x=-1\)
Vậy \(x=-1.\)
3 ) \(-12+3\left(-x+7\right)=-18\)
\(\Leftrightarrow3x+9=-18\)
\(\Leftrightarrow3x=-27\)
\(\Leftrightarrow x=-9\)
Vậy \(x=-9.\)
4 ) \(24:\left(3x-2\right)=-3\)
\(\Leftrightarrow\left(3x-2\right)=-8\)
\(\Leftrightarrow3x=-6\)
\(\Leftrightarrow x=-2\)
Vậy \(x=-2.\)
5 ) \(-45:5.\left(-3-2x\right)=3\)
\(\Leftrightarrow-9\left(-3-2x\right)=3\)
\(\Leftrightarrow18x+27=3\)
\(\Leftrightarrow18x=-24\)
\(\Leftrightarrow x=-\frac{4}{3}\)
Vậy \(x=-\frac{4}{3}.\)
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