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thì giá trị của x là 4,\(\sqrt{x}\)=\(\sqrt{4}\)=2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\Leftrightarrow-\dfrac{1}{2}x=\dfrac{1}{4}\Leftrightarrow x=-\dfrac{1}{2}\\ b,\Leftrightarrow\dfrac{1}{6}:x=\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{5}{6}\Leftrightarrow x=\dfrac{1}{6}:\dfrac{5}{6}=\dfrac{1}{5}\\ c,\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{5}=3\\x+\dfrac{1}{5}=-3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{14}{5}\\x=-\dfrac{16}{5}\end{matrix}\right.\)
\(d,\Leftrightarrow\left(x+\dfrac{1}{2}\right)^2=\dfrac{22}{9}-\dfrac{7}{3}=\dfrac{1}{9}\\ \Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=\dfrac{1}{3}\\x+\dfrac{1}{2}=-\dfrac{1}{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{6}\\x=-\dfrac{5}{6}\end{matrix}\right.\\ e,\Leftrightarrow2\left|x\right|=2-\dfrac{1}{2}=\dfrac{3}{2}\\ \Leftrightarrow\left[{}\begin{matrix}2x=\dfrac{3}{2}\\2x=-\dfrac{3}{2}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{4}\\x=-\dfrac{3}{4}\end{matrix}\right.\)
\(f,\Leftrightarrow\left|x+\dfrac{1}{2}\right|=1+\dfrac{1}{6}=\dfrac{7}{6}\\ \Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=\dfrac{7}{6}\\x+\dfrac{1}{2}=-\dfrac{7}{6}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-\dfrac{5}{3}\end{matrix}\right.\)
e: ta có: \(2\left|x\right|+\dfrac{1}{2}=2\)
\(\Leftrightarrow2\left|x\right|=\dfrac{3}{2}\)
\(\Leftrightarrow\left|x\right|=\dfrac{3}{4}\)
hay \(x\in\left\{\dfrac{3}{4};-\dfrac{3}{4}\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 16:
a: \(x=2\sqrt{x}\)
\(\Leftrightarrow\sqrt{x}\left(\sqrt{x}-2\right)=0\)
=>x=0 hoặc x=4
b: \(\Leftrightarrow\left(x-1\right)^2=\dfrac{9}{16}\)
=>x-1=3/4 hoặc x-1=-3/4
=>x=7/4 hoặc x=1/4
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\left(\sqrt{a}+\sqrt{b}\right)^2=a+b+2\sqrt{ab}\)
Tương tự: \(\left(\sqrt{a+b}\right)^2=a+b\)
Nhận thấy: \(\left(\sqrt{a}+\sqrt{b}\right)^2>\left(\sqrt{a+b}\right)^2\)
Suy ra: \(\sqrt{a}+\sqrt{b}>\sqrt{a+b}\)
C
Thanks