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4:
=>(2x+3,5)=7/12*3/14=21/168=1/8
=>2x=1/8-7/2=1/8-28/8=-27/8
=>x=-27/16
5: =>1/3:3x=-21/4
=>3x=-1/3:21/4=-1/3*4/21=-4/63
=>x=-4/189
6: =>2+7/9-3/4(x+1)=7/9
=>2-3/4(x+1)=0
=>3/4(x+1)=2
=>x+1=2:3/4=2*4/3=8/3
=>x=5/3
a) \(\left(2x-1\right)^5=243\)
\(\left(2x-1\right)^5=3^5\)
\(\Rightarrow2x-1=3\)
\(2x=3+1\)
\(2x=4\)
\(x=\frac{4}{2}\)
\(x=2\)
Vậy .......
b) \(\left(3x+2\right)^3=125\)
\(\left(3x+2\right)^3=5^3\)
\(\Rightarrow3x+2=5\)
\(3x=5-2\)
\(3x=3\)
\(x=\frac{3}{3}=1\)
Vậy ..........
ta có : \(\left(3x-1\right)^3=125\Leftrightarrow\left(3x-1\right)^3=5^3\Rightarrow3x-1=5\)
\(\Leftrightarrow3x=5+1=6\Leftrightarrow x=\dfrac{6}{3}=2\) vậy \(x=2\)
ta có : \(x^{2010}=x\Leftrightarrow x^{2010}-x=0\Leftrightarrow x\left(x^{2009}-1\right)=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x^{2009}-1=0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x^{2009}=1\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x=1\end{matrix}\right.\) vậy \(x=0;x=1\)
a) 7 x . 49 = 7 50
7x . 72 = 750
7x = 750 : 72
7x = 748
x = 48
b) (2x – 1)3 = 125
(2x – 1)3 = 53
2x – 1 = 5
2x = 5 + 1
2x = 6
x = 6 : 2 = 3
c) x2010 = x
x2010 – x = 0
x(x2009 – 1) = 0
x = 0 hoặc x2009 – 1 = 0
x = 0 hoặc x2009 = 1
x = 0 hoặc x = 1
(x-15):5+22=24
(x-15):5=22+24
(x-15):5=46
x-15=46.5
x-15=230
x=230+15
x=245
3^x.5=405
3^x=405:5
3^x=81
=>x=4
(3x-1)^3=125
(x-15):5+22=24
=>(x-15):5=24-22
=>(x-15):5=2
=>x-15=2x5
=>x-15=10
=>x=10+15
=>x=25
3x.5=405
=>3x=405:5
=>3x=81
Mà: 34=81
=> 3x=34=81
=>x=4
(3x-1)3=125
=> 3x-1=5
=>3x=5+1
=>3x=6
=>x=6:3
=>x=2
`\color{grey}\text{#071931}`
`(4 + 2x) * (9 - 3x) = 0`
TH1: `4 + 2x = 0 => 2x = -4 => x = -2`
TH2: `9 - 3x = 0 => 3x = 9 => x = 3`
Vậy, `x \in {-2; 3}`
____
`(3x - 19)^3 = 125`
`=> (3x - 19)^3 = 5^3`
`=> 3x - 19 = 5`
`=> 3x = 24`
`=> x = 8`
Vậy, `x = 8.`
`(3x - 1)^3 = 125`
`(3x - 1)^3 = 5^3`
`=> 3x - 1 = 5`
`3x = 5 + 1`
`3x = 6`
`x = 6 : 3`
`x = 3`
Vậy `x = 3`
`@btran`