(x+1/5)2+17/25=26/25
(x+1/5)2 =26/25-17/25
(x+1/5)2 =9/25
⇒(x+1/5)2=(3/5)2 hoặc (x+1/5)2=(-3/5)2
x+1/5=3/5 hoặc x+1/5=-3/5
x=2/5 hoặc x=-4/5
Chúc bạn học tốt!
Ta có: \(\left(x+\dfrac{1}{5}\right)^2+\dfrac{17}{25}=\dfrac{26}{25}\)
\(\Leftrightarrow\left(x+\dfrac{1}{5}\right)^2=\dfrac{9}{25}\)
\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{5}=\dfrac{3}{5}\\x+\dfrac{1}{5}=\dfrac{-3}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{5}\\x=\dfrac{-4}{5}\end{matrix}\right.\)
Vậy: \(x\in\left\{\dfrac{2}{5};\dfrac{-4}{5}\right\}\)
(x+1/5)2+17/25=26/25
(x+1/5)2 =26/25-17/25
(x+1/5)2 =9/25
⇒(x+1/5)2=(3/5)2 hoặc (x+1/5)2=(-3/5)2
x+1/5=3/5 hoặc x+1/5=-3/5
x=2/5 hoặc x=-4/5
