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\(\left|2x^2-27\right|^{2019}+\left(5y+12\right)^{2018}=0.\)
\(\text{Ta có}\hept{\begin{cases}\left|2x^2-27\right|^{2019}\ge0\\\left(5y+12\right)^{2018}\ge0\end{cases}}\text{Mà}\left|2x^2-27\right|^{2019}+\left(5y+12\right)^{2018}=0\)
\(\Rightarrow\hept{\begin{cases}\left|2x^2-27\right|^{2019}=0\\\left(5y+12\right)^{2018}=0\end{cases}\Rightarrow\orbr{\begin{cases}\left(2x-27\right)^{2019}=0\\\left(5y+12\right)^{2018}=0\end{cases}\Rightarrow\orbr{\begin{cases}2x-27=0\\5y+12=0\end{cases}\Rightarrow\orbr{\begin{cases}2x=27\\5y=-12\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{27}{2}\\y=\frac{-12}{5}\end{cases}}}}}}\)
\(\text{Vậy}\hept{\begin{cases}x=\frac{27}{2}\\y=\frac{-12}{5}\end{cases}}\)
I 2x-3 I = I x+1 I
2x-3 = x+1
x+1 - 2x+3=0
x (1-2) +1+3=0
-1x +4 =0
-1x = 0-4
-1x =-4
x = -4 : -1
x =4
Trả lời:
\(\left|2x-3\right|=\left|x+1\right|\)
\(\Rightarrow2x-3=x+1\) hoặc \(2x-3=-\left(x+1\right)\)
TH1: \(2x-3=x+1\)
\(2x-x=1+3\)
\(x=4\)
TH2: \(2x-3=-\left(x+1\right)\)
\(2x-3=-x-1\)
\(2x+x=-1+3\)
\(3x=2\)
\(x=\frac{2}{3}\)
Vậy \(x=4;x=\frac{2}{3}\)
Áp dụng tính chất của dãy tỉ số bằng nhau ta có :
\(\frac{2x+1}{5}=\frac{3y-2}{7}=\frac{2x+3y-1}{6}=\frac{2x+1+3y-2-2x-3y+1}{5+7-6}=\frac{0}{6}=0\)
\(\Rightarrow2x+1=0\Rightarrow2x=-1\Rightarrow x=-\frac{1}{2};\)
\(3y-2=0\Rightarrow3y=2\Rightarrow y=\frac{2}{3}\)
Vậy \(x=-\frac{1}{2};y=\frac{2}{3}\)
Áp dụng tc cua dtsbn ta có
\(\frac{2x+1}{5}=\frac{3y-2}{7}=\frac{2x+3y-1}{6x}=\frac{2x+1+3y-2}{5+7}=\frac{2x+3y-1}{12}\left(1\right)\)
\(\Rightarrow\frac{2x+3y-1}{6x}=\frac{2x+3y-1}{12}\Rightarrow6x=12\Rightarrow x=2\)
Thay vào 1 ta có:\(\frac{2.2+1}{5}=\frac{3y-2}{7}\Rightarrow1=\frac{3y-2}{7}\Rightarrow\frac{3y-2}{7}=1\)
\(\Rightarrow3y-2=7\Rightarrow3y=9\Rightarrow y=3\)
Vậy.....
Từ 2x = 3y = -2z suy ra \(\frac{2x}{1}=\frac{3y}{1}=\frac{2z}{-1}\)
\(=\frac{2x}{1}=\frac{3y}{1}=\frac{4z}{-2}=\frac{2x-3y+4z}{1-1+\left(-2\right)}=\frac{48}{-2}=-24\)
Với \(\frac{2x}{1}=-24\Rightarrow x=-12\)
Với \(\frac{3y}{1}=-24\Rightarrow y=-8\)
Với \(\frac{4z}{-2}=-24\Rightarrow z=12\)
Vì 2x = 3y = -2z nên -3y = -2x , 4z = -4x
=> 2x-3y+4z = 2x-2x-4x = 48 <=> x = -12
=> y = -8 ; z = 12
=>(2x-1)^2=24^2
=>2x-1=24 hoặc 2x-1=-24
=>x=-23/2 hoặc x=25/2
Ta có : (2x + 1)4 = (2x + 1)6
=> (2x + 1)4 - (2x + 1)6 = 0
<=> (2x + 1)4[1 - (2x + 1)2] = 0
\(\Leftrightarrow\orbr{\begin{cases}\left(2x+1\right)^4=0\\1-\left(2x+1\right)^2=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x+1=0\\\left(2x+1\right)^2=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=-1\\\left(2x+1\right)=1;-1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-\frac{1}{2}\\2x=0;-2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-\frac{1}{2}\\x=0;-1\end{cases}}\)
Vậy x thuộc \(-\frac{1}{2};0;-1\)
\(\left(2x-1\right)^{2018}=\left(2x-1\right)^{2016}\)
\(\Rightarrow\left(2x-1\right)^{2018}-\left(2x-1\right)^{2016}=0\)
\(\Rightarrow\left(2x-1\right)^{2016}\left[\left(2x-1\right)^2-1\right]=0\)
\(\Rightarrow\orbr{\begin{cases}\left(2x-1\right)^{2016}=0\\\left(2x-1\right)^2-1=0\end{cases}}\Rightarrow\orbr{\begin{cases}\left(2x-1\right)^{2016}=0\\\left(2x-1\right)^2=1\end{cases}}\)
TH 1 : \(\left(2x-1\right)^{2016}=0\Rightarrow2x-1=0\Rightarrow2x=1\Rightarrow x=\frac{1}{2}\)
TH 2 : \(\left(2x-1\right)^2=1\Rightarrow\orbr{\begin{cases}2x-1=1\\2x-1=-1\end{cases}}\Rightarrow\orbr{\begin{cases}2x=2\\2x=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\x=0\end{cases}}\)
Vậy \(x\in\left\{\frac{1}{2};1;0\right\}\)
_Chúc bạn học tốt_
( 2x - 1 )2018 = ( 2x - 1 )2016
( 2x - 1 )2 = 0
( 2x )2 - 1 = 0
4x2 = 1
x2 = 1 / 4 \(\Rightarrow\orbr{\begin{cases}x=\frac{1}{2}\\x=-\frac{1}{2}\end{cases}}\)