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a) Ta có: \(\dfrac{x-1}{-4}=\dfrac{-4}{x-1}\)
\(\Leftrightarrow\left(x-1\right)^2=16\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=4\\x-1=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-3\end{matrix}\right.\)
Vậy: \(x\in\left\{5;-3\right\}\)
b) Ta có: \(\dfrac{x-4}{6}=\dfrac{-1}{3}\)
\(\Leftrightarrow x-4=-2\)
hay x=2
Vậy: x=2
a/
\(x-\dfrac{1}{-4}=-\dfrac{4}{x-1}\)
\(x+\dfrac{1}{4}+\dfrac{4}{x-1}=0\)
\(\dfrac{x\left(x-1\right)4}{4\left(x-1\right)}+\dfrac{16}{4\left(x-1\right)}=0\)
\(4x\left(x-1\right)+16=0\)(quy tắc khử mẫu lớp 8)
\(4x^2-4x+16=0\)
\(4x^2-2x-2x+16=0\)
\(\left(4x^2-2x\right)-\left(2x-16\right)=0\)
\(2x\left(2x-1\right)-2\left(x-16\right)=0\)
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a) Ta có: \(x+\dfrac{1}{3}=\dfrac{2}{6}\)
\(\Leftrightarrow x+\dfrac{1}{3}=\dfrac{1}{3}\)
hay x=0
Vậy: x=0
b) Ta có: \(x-\dfrac{1}{4}=\dfrac{1}{-2}\)
\(\Leftrightarrow x-\dfrac{1}{4}=\dfrac{-1}{2}\)
\(\Leftrightarrow x=\dfrac{-1}{2}+\dfrac{1}{4}=\dfrac{-2}{4}+\dfrac{1}{4}=\dfrac{-1}{4}\)
Vậy: \(x=-\dfrac{1}{4}\)
c) Ta có: \(\dfrac{-1}{6}=\dfrac{3}{2}x\)
\(\Leftrightarrow x=\dfrac{-1}{6}:\dfrac{3}{2}=\dfrac{-1}{6}\cdot\dfrac{2}{3}\)
hay \(x=\dfrac{-1}{9}\)
Vậy: \(x=\dfrac{-1}{9}\)
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\(-\frac{10}{6}-\frac{4}{3}=-\frac{5}{3}-\frac{4}{3}=-\frac{9}{3}=-3\)
\(\frac{1}{2}+\frac{1}{3}=\frac{3+2}{6}=\frac{5}{6}\)
Vậy -3<x<5/6
x=-1; x=-2 và x=0
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Các bạn giúp mình giải với nhé! Đúng thì mình k đúng nhé. Cảm ơn các bạn nhiều lắm. Yêu cả nhà.
\(1.\left(x-5\right)^{23}.\left(y+2\right)^7=0\)
\(\Rightarrow\hept{\begin{cases}\left(x-5\right)^{23}=0\\\left(y+2\right)^7=0\end{cases}\Rightarrow\hept{\begin{cases}\left(x-5\right)^{23}=0^{23}\\\left(y+2\right)^7=0^7\end{cases}}}\)\(\Rightarrow\hept{\begin{cases}x-5=0\\y+2=0\end{cases}\Rightarrow\hept{\begin{cases}x=0+5\\y=0-2\end{cases}}}\)\(\Rightarrow\hept{\begin{cases}x=5\\y=-2\end{cases}}\)
Vậy \(\left(x;y\right)=\left(5;-2\right)\)
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1) \(2^x=4^3 \Leftrightarrow2^x=2^6\Leftrightarrow x=6\)
2) \(2^x=4^6\Leftrightarrow2^x=2^{12}\Leftrightarrow x=12\)
3) \(3^x=9^{10}\Leftrightarrow3^x=3^{20}\Leftrightarrow x=20\)
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a) 2x + 1 = 3
2x = 2
x = 1
b) ( 2x - 5 ) + 17 = 6
( 2x - 5 ) = 6 - 17
( 2x - 5 ) = -11
2x = -11 + 5
2x = -6
x = -3
c) 10 - 2 x ( 4 - 3x ) = -4
2 x ( 4 - 3x ) = 14
4 - 3x = 7
3x = -3
x = -1
x= 18/24