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\(\left(x+\dfrac{1}{5}\right)^2=\dfrac{9}{25}\)
\(\left[{}\begin{matrix}x+\dfrac{1}{5}=\dfrac{3}{5}\\x+\dfrac{1}{5}=-\dfrac{3}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{5}\\x=-\dfrac{4}{5}\end{matrix}\right.\)
\(\left(x+\dfrac{1}{5}\right)^2=\dfrac{26}{25}+\dfrac{17}{25}\\ \left(x+\dfrac{1}{5}\right)^2=\dfrac{43}{25}\\ x+\dfrac{1}{5}=\dfrac{\sqrt{45}}{5}\\ x=\dfrac{\sqrt{45}}{5}-\dfrac{1}{5}\\ x=\dfrac{-1+\sqrt{43}}{5}\)
\(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
\(\Rightarrow\left(x+\frac{1}{5}\right)^2=\frac{26}{25}-\frac{17}{25}\)
\(\Rightarrow\left(x+\frac{1}{5}\right)^2=\frac{9}{25}=\frac{3}{5}^2\)
\(\Rightarrow x^2=\frac{3}{5}^2-\frac{1}{5}^2=\frac{2}{5}^2\)
\(\Rightarrow x=\frac{2}{5}\)
Mk nhanh nhất k mk nka!!!^_^^_^^_^
\(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
\(\left(x+\frac{1}{5}\right)^2=\frac{26}{25}-\frac{17}{25}\)
\(\left(x+\frac{1}{5}\right)^2=\frac{9}{25}\)
\(\Rightarrow\orbr{\begin{cases}x+\frac{1}{5}=\frac{3}{5}\\x+\frac{1}{5}=-\frac{3}{5}\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{2}{5}\\x=-\frac{4}{5}\end{cases}}}\)
\(\Rightarrow x\in\left\{-\frac{4}{5};\frac{2}{5}\right\}\)
(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
=> x+1/5 = 3/5
x = 3/5-1/5
x = 2/5
Pls cho mk nha
(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 =26/25-17/25
<=> (x +1/5)^2 =(3/5)^2
<=> x+1/5=3/5
=> x= 2/5
Ta có: \(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
<=> \(\left(x+\frac{1}{5}\right)^2=\frac{26}{25}-\frac{17}{25}=\frac{9}{25}\)
<=> \(x+\frac{1}{5}=\frac{9}{25}\)và \(x+\frac{1}{5}=-\frac{9}{25}\)
=> x= \(\frac{4}{25}\) và x=\(-\frac{14}{25}\)
\(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
\(\left(x+\frac{1}{5}\right)^2=\frac{9}{25}\)
\(x+\frac{1}{5}=\frac{3}{5}\)
\(x=\frac{2}{5}\)
#H
(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 và (-3/5)^2
=> x + 1/5= 3/5 và x + 1/5=-3/5
=> x = 3/5 - 1/5 và x = -3/5 - 1/5
=> x = 2/5 và x = -4/5
Vậy x e { 2/5:-4/5}
***** " e" ở đây tức là thuộc nha