HOC24
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\(\left\{{}\begin{matrix}5x-y=3\\-10x+2y=-6\end{matrix}\right.\)
\(\left\{{}\begin{matrix}-4x+y+12=0\\x-y-2=0\end{matrix}\right.\)
\(\left\{{}\begin{matrix}2x+3y=2\\x+2y=3\end{matrix}\right.\)
\(\dfrac{x+1}{x-1}-\dfrac{3x+1}{x^2-x}\)=\(\dfrac{1}{x}\)
\(\dfrac{3+\sqrt{3}}{\sqrt{3}+1}\)-\(\sqrt{3}\)
A=\(\dfrac{4}{\sqrt{5}+1}\)-\(\sqrt{9-4\sqrt{5}}\)