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truongvonghia

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nttthn_97

1) http://diendan.hocmai.vn/showthread.php?t=296761

2) http://diendan.hocmai.vn/showthread.php?t=294872

3) [TEX]\Leftrightarrow \left\{\begin{matrix} x \geq 4\\ \sqrt{2(x^2-16)} +x-3> 7-x\end{matrix}\right.[/TEX]

[TEX]\Leftrightarrow \left\{\begin{matrix} x \geq 4\\\sqrt{2(x^2-16)} > 10-2x\end{matrix}\right.[/TEX]

[TEX]\Leftrightarrow \left[\begin{matrix} \left\{\begin{matrix} x \geq 4 \\ 10-2x<0\end{matrix}\right. \\ \left\{\begin{matrix} x \geq 4\\ 10-2x \geq 0\\ 2(x^2-16)> 100-40x+4x^2\end{matrix}\right. \end{matrix}\right.[/TEX]
 
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