\(a,\Rightarrow\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\\ b,\Rightarrow\left[{}\begin{matrix}x=0,2\\x=-0,2\end{matrix}\right.\\ c,\Rightarrow\left[{}\begin{matrix}x=\sqrt{7}\\x=-\sqrt{7}\end{matrix}\right.\\ d,\Rightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-\dfrac{2}{3}\end{matrix}\right.\\ e,\Rightarrow x^2=\dfrac{16}{25}\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{5}\\x=-\dfrac{4}{5}\end{matrix}\right.\\ f,\Rightarrow x^2=\dfrac{7}{36}\Rightarrow\left[{}\begin{matrix}x=\dfrac{\sqrt{7}}{6}\\x=-\dfrac{\sqrt{7}}{6}\end{matrix}\right.\\ g,\Rightarrow x^2=-1\Rightarrow x\in\varnothing\)
a ) x=3
b) x=0,2
c)2,645751311
d)\(\dfrac{2}{3}\)
a) \(\Rightarrow\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)
b) \(\Rightarrow\left[{}\begin{matrix}x=0,2\\x=-0,2\end{matrix}\right.\)
c) \(\Rightarrow\left[{}\begin{matrix}x=\sqrt{7}\\x=-\sqrt{7}\end{matrix}\right.\)
d) \(\Rightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-\dfrac{2}{3}\end{matrix}\right.\)
e) \(\Rightarrow x^2=\dfrac{16}{25}\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{5}\\x=-\dfrac{4}{5}\end{matrix}\right.\)
f) \(\Rightarrow x^2=\dfrac{7}{36}\Rightarrow\left[{}\begin{matrix}x=\dfrac{\sqrt{7}}{6}\\x=-\dfrac{\sqrt{7}}{6}\end{matrix}\right.\)
g) \(\Rightarrow x^2=-1\left(VLý\right)\Rightarrow S=\varnothing\)
