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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
-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
\(5\left(7+48:x\right)=45\)
\(\Leftrightarrow\left(7+48x\right)=9\)
\(\Leftrightarrow4x=2\)
\(\Leftrightarrow x=2\)
________________
\(5^2x-3.2.5^2=5^2.3\)
\(\Leftrightarrow5x^2-3-2.5^2=75\)
\(\Leftrightarrow5x^2-3-50=75\)
\(\Leftrightarrow5x^2-3=125\)
\(\Leftrightarrow5x^2=128\)
\(\Leftrightarrow x^2=\frac{128}{5}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{128}{5}\\x=-\frac{128}{5}\end{cases}}\)
___________________
\(2+x:5=0\)
\(\Leftrightarrow x:5=-2\)
\(\Leftrightarrow x=-10\)
\(10+2x=16\)
\(\Leftrightarrow2x=6\)
\(\Leftrightarrow x=3\)
- 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.
\(\Leftrightarrow x-45:-15-10x=3\)
\(\Rightarrow x=0\)
-45:5.(-3-2x)=3
-9.(-3-2x)=3
-3-2x=3:(-9)
-3-2x=\(-\frac{1}{3}\)
2x=-3-(\(-\frac{1}{3}\))
2x=\(-\frac{8}{3}\)
x=\(-\frac{8}{3}\):2
x=\(-\frac{4}{3}\)
vậy..
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=-6
x=-6:3
x=-2
Vậy x=-2
-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