Bài làm
6) \(\left(x+\frac{1}{2}\right)^2=\frac{5}{5}\)
\(\Rightarrow\left(x+\frac{1}{2}\right)^2=1^2\)
\(\Rightarrow x+\frac{1}{2}=1\)
\(\Rightarrow x=1-\frac{1}{2}=\frac{1}{2}\)
Vậy x = 1/2
7) \(\left|\left(-2\frac{2}{3}\right)^2-x\right|-\frac{1}{3}=0\)
\(\Rightarrow\left|\left(-\frac{8}{3}\right)^2-x\right|=\frac{1}{3}\)
\(\Rightarrow\left|\frac{64}{9}-x\right|=\frac{1}{3}\)
\(\Rightarrow\left[{}\begin{matrix}\frac{64}{9}-x=\frac{1}{3}\\\frac{64}{9}-x=-\frac{1}{3}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\frac{61}{9}\\x=\frac{67}{9}\end{matrix}\right.\)
Vậy ....