\(\frac{x}{0,16}=\frac{9}{x}\)
\(\Rightarrow x^2=0,16.9=\frac{36}{25}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{9}{5}\\x=-\frac{9}{5}\end{array}\right.\)
\(\frac{x}{0,16}=\frac{9}{x}\)
\(\Leftrightarrow x.x=0,16.9\)
\(\Leftrightarrow x^2=1,44=\left(\pm1,2\right)^2\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=1,2\\x=-1,2\end{array}\right.\)
Vậy \(x\in\left\{1,2;-1,2\right\}\)
Chúc bạn học tốt!
\(x^2=\frac{36}{25}\Rightarrow x=\pm\frac{6}{5}\)
\(x:0,16=9:x\Rightarrow\frac{x}{0,16}=\frac{9}{x}\)
Áp dụng tính chất tỉ lệ thức, ta có :
\(x.x=0,16.9\)
\(\Leftrightarrow x^2=1,44\)
\(\Rightarrow x^2=\begin{cases}1,2^2\\\left(-1,2\right)^2\end{cases}\)
\(\Rightarrow x\begin{cases}1,2\\-1,2\end{cases}\)
