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\(\Rightarrow\left(3x-1\right)^{20}-\left(3x-1\right)^{10}=0\\ \Rightarrow\left(3x-1\right)^{10}\left[\left(3x-1\right)^{10}-1\right]=0\\ \Rightarrow\left[{}\begin{matrix}3x-1=0\\\left(3x-1\right)^{10}=1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}3x-1=0\\3x-1=1\\3x-1=-1\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=\dfrac{2}{3}\\x=0\end{matrix}\right.\)
\(\Rightarrow x=0\)
Thử \(\left(3x-1\right)^{10}=\left(3.0-1\right)^{10}=\left(-1\right)^{10}=1\)
\(\left(3x-1\right)^{20}=\left(3.0-1\right)^{20}=\left(-1\right)^{20}=1\)
Suy ra \(\left(3x-1\right)^{10}=\left(3x-1\right)^{20}\)
(3x - 1)10 = (3x - 1)20
(3x - 1)20 - (3x - 1)10 = 0
(3x - 1)10 . (3x - 1)10 - (3x - 1)10 . 1 = 0
(3x - 1)10 . [(3x - 1)10 - 1] = 0
\(\Rightarrow\orbr{\begin{cases}\left(3x-1\right)^{10}=0\\\left(3x-1\right)^{10}-1=0\end{cases}}\Rightarrow\orbr{\begin{cases}3x-1=0\\\left(3x-1\right)^{10}=1\end{cases}}\)
3x - 1 = 0 (3x - 1)10 = 1
=> 3x = 1 3x - 1 = 1 hoặc 3x - 1 = -1
=> x = \(\frac{1}{3}\) 3x = 2 hoặc 3x = 0
x = \(\frac{2}{3}\) hoặc x = 0
a: =-3/4-1/4+2/7+5/7+2023/2024
=-1+1+2023/2024=2023/2024
b: 2/3x=2/7
=>x=2/7:2/3=3/7
c; =>2/3x=1/10+1/2=1/10+5/10=6/10=3/5
=>x=3/5:2/3=3/5*3/2=9/10
* Trả lời:
\(\left(1\right)\) \(-3\left(1-2x\right)-4\left(1+3x\right)=-5x+5\)
\(\Leftrightarrow-3+6x-4-12x=-5x+5\)
\(\Leftrightarrow6x-12x+5x=3+4+5\)
\(\Leftrightarrow x=12\)
\(\left(2\right)\) \(3\left(2x-5\right)-6\left(1-4x\right)=-3x+7\)
\(\Leftrightarrow6x-15-6+24x=-3x+7\)
\(\Leftrightarrow6x+24x+3x=15+6+7\)
\(\Leftrightarrow33x=28\)
\(\Leftrightarrow x=\dfrac{28}{33}\)
\(\left(3\right)\) \(\left(1-3x\right)-2\left(3x-6\right)=-4x-5\)
\(\Leftrightarrow1-3x-6x+12=-4x-5\)
\(\Leftrightarrow-3x-6x+4x=-1-12-5\)
\(\Leftrightarrow-5x=-18\)
\(\Leftrightarrow x=\dfrac{18}{5}\)
\(\left(4\right)\) \(x\left(4x-3\right)-2x\left(2x-1\right)=5x-7\)
\(\Leftrightarrow4x^2-3x-4x^2+2x=5x-7\)
\(\Leftrightarrow-x-5x=-7\)
\(\Leftrightarrow-6x=-7\)
\(\Leftrightarrow x=\dfrac{7}{6}\)
\(\left(5\right)\) \(3x\left(2x-1\right)-6x\left(x+2\right)=-3x+4\)
\(\Leftrightarrow6x^2-3x-6x^2-12x=-3x+4\)
\(\Leftrightarrow-15x+3x=4\)
\(\Leftrightarrow-12x=4\)
\(\Leftrightarrow x=-\dfrac{1}{3}\)
\(\left(3x-1\right)^{10}=\left(3x-1\right)^{20}\)
\(\Rightarrow\left(3x-1\right)^{20}-\left(3x-1\right)^{10}=0\)
\(\left(3x-1\right)^{10}.\left[\left(3x-1\right)^{10}-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(3x-1\right)^{10}=0\\\left(3x-1\right)^{10}-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}3x-1=0\\3x-1^{10}=1\end{cases}}}\)\(\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{3}\\x=\frac{2}{3}ho\text{ặc}x=0\end{cases}}\)
Vậy \(x=\frac{1}{3}ho\text{ặc}x=\frac{2}{3}ho\text{ặc}x=0\)
Tham khảo nhé~
TA CÓ:\(\left(3x-1\right)^{10}-\left(3x-1\right)^{20}=0\)
\(\Rightarrow\left(3x-1\right)^{10}-\left(3x-1\right)^{10}\times\left(3x-1\right)^{10}=0\)
\(\Rightarrow\left(3x-1\right)^{10}\times[1-\left(3x-1\right)^{10}]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(3x-1\right)^{10}=0\\1-\left(3x-1\right)^{10}=0\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{1}{3}\\x=\frac{2}{3}\end{cases}}}\)
mik nha. cảm ơn nhìu!! ^^
`(3x-1)^10=(3x-1)`
`=>(3x-1)^10 :(3x-1)=(3x-1):(3x-1)`
`=>(3x-1)^9=1`
`=>3x-1=1`
`=>3x=2`
`=>x=2/3`
(3X - 1)10 = (3X -1)
(3X - 1)10 - (3X - 1) = 0
(3X - 1){(3X -1)9 - 1} = 0
3X - 1 = 0 hoặc (3X -1 )9 = 1
3X - 1 = 0
3X = 1
X = 1/3
(3X - 1 )9 - 1 = 0
(3X - 1)9 = 1
3X - 1 = 1
3X = 2
X = 2/3
vậy X ϵ { 1/3;2/3}