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a) x + 45 -[ 90 + (-20) + 5 - (-45)] +3x
= x +45 -( 90 - 20 + 5 + 45) + 3x
= x +45 -120 +3x
= -75 +4x
b) x +(-294 +13 -2x) +(94 -13) +9x
= x -281 -2x +81 +9x
= -200 +8x
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
(x – 2) – (39 – 45) = | - 5| - | -10|
(x - 2) - 6 = 5 - 10
(x - 2) - 6 = - 5
x - 2 = - 5 + 6
x - 2 = 1
x = 1 + 2
x = 3
Vậy x = 3
\(\left(x-2\right)+6=-5\)
\(\Rightarrow x-2=-11\)
\(\Rightarrow x=-9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`-45 : 5 . ( -3 - 2x ) = 3`
`5 . ( -3 - 2x ) = -45 : 3`
`5 . ( -3 - 2x ) = -15`
`-3 - 2x = -15 : 5`
`-3 - 2x = -3`
`-2x = -3 + 3`
`-2x = 0`
`x = 0`
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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
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\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-45 : 5 . ( -3 - 2x ) = 3
5 . ( -3 - 2x ) = ( -45 ) : 3
5 . ( -3 - 2x ) = -15
-3 - 2x = ( -15 ) : 5
-3 - 2x = -3
2x = ( - 3 ) - ( -3 )
2x = 0
x = 0 : 2
x = 0
=> 5.(-3-2x) = -45 : 3 = -15
=> -3-2x = -15 : 5 = -3
=> 2x = -3 - (-3) = 0
=> x = 0 : 2 = 0
Vậy x = 0
Tk mk nha
2x+5= - 45
2x = - 45-5
2x = - 50
x = - 50 : 2
x =- 25