-45:5.(-3-2x)=3
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`-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`
-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
-45 : 5 . ( -3 - 2x ) = 3
5 . ( -3 - 2x ) = -15
-3 - 2x = -3
2x = 0
x = 0 : 2
x = 0
<=> -9 . ( -3 -2x ) = 3
<=> 27 + 18x = 3
<=> 18x = 3 - 27
<=> 18x = -24
<=> x = -24 : 18
<=> x = -4/3
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
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
a/ => 2x - 4 = 22 = 4
=> 2x = 8
=> x = 4
b/ => 60 : 2x = 10
=> 2x = 6
=> x = 3
c/ => 5(2x - 3) = 25
=> 2x - 3 = 5
=> 2x = 8
=> x = 4
d/ => 3x - 6 = 34 : 3 = 33 = 27
=> 3x = 33
=> x = 11
\(5\left(7+48:x\right)=45\)
\(\Leftrightarrow\left(7+48x\right)=9\)
\(\Leftrightarrow4x=2\)
\(\Leftrightarrow x=2\)
________________
\(5^2x-3.2.5^2=5^2.3\)
\(\Leftrightarrow5x^2-3-2.5^2=75\)
\(\Leftrightarrow5x^2-3-50=75\)
\(\Leftrightarrow5x^2-3=125\)
\(\Leftrightarrow5x^2=128\)
\(\Leftrightarrow x^2=\frac{128}{5}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{128}{5}\\x=-\frac{128}{5}\end{cases}}\)
___________________
\(2+x:5=0\)
\(\Leftrightarrow x:5=-2\)
\(\Leftrightarrow x=-10\)
\(10+2x=16\)
\(\Leftrightarrow2x=6\)
\(\Leftrightarrow x=3\)
- 45 : 5 . ( - 3 - 2x ) = 3
- 9 . ( - 3 - 2x ) = 3
- 3 - 2x = - 9 : 3
- 3 - 2x = - 3
2x = -3 + ( - 3 )
2x = - 6
x = - 6 : 2
x = -3
-45:5.(-3-2x)=3
=>-9.(-3-2x)=3
=>-3-2x=-1/3
=>2x=-3-(-1/3)
=>x=-8/3:2
=>x=-4/3.