cau 1:tim $m$ de he sau co 2 nghiem phan biet:
$\begin{cases}x^{3}\sqrt{x+2}-4x^{2}+3x-2\sqrt{x+7}\geq 0 \\ mx(x+1+2\sqrt{x+2})+27m= x+\sqrt{x+2}\end{cases}$
cau 2: tim $m$ de he sau co nghiem:
$\begin{cases}x^{3}+3mx+2\leq 0 \\ x^{3}+5x^{2}+17x+7 \geq 2(x^{2}+4)\sqrt{2x^{2}+7}\end{cases}$