Giải bất phương trình sau trên tập R :

   

       $\frac{5x-13-\sqrt{57+10x-3x^{2}}}{\sqrt{x+3}-\sqrt{19-3x}}\geq x^{2}+2x+9$
ĐK:............
BPT $\Leftrightarrow 2\sqrt{x+3}+\sqrt{19-3x}+2\sqrt{x+3}\geq x^2+2x+9$
$\Leftrightarrow \sqrt{19-3x}+4\sqrt{x+3}\geq x^2+2x+9$
$\Leftrightarrow (\sqrt{19-3x}-\frac{13-x}{3})+4(\sqrt{x+3}-\frac{x+5}{3})\geq x^2+x-2$
$\Leftrightarrow \frac{(-x^2-x+2)}{9(\sqrt{19-3x}+(\frac{13-x}{3})^2)}+\frac{4(-x^2-x+2)}{9(\sqrt{x+3}+(\frac{x+5}{3})^2)}\geq x^2+x-2$
$\Leftrightarrow (x^2+x-2).f(x)\leq 0$
Luôn có $f(x)>0$
$\rightarrow -2\leq x\leq 1./$

vậy thử lại coi :( –  Confusion 14-07-16 03:00 PM
mình thay thử kết quả vô ko đúng ? –  phuongnam2929 13-07-16 07:40 PM
sai đâu nhỉ? ==" –  Confusion 12-07-16 01:26 PM
ủa mà đáp án thay vô k đúng ?? –  phuongnam2929 11-07-16 09:20 PM
KHÔNG HIỂU J HẾT NGAY TỪ DÒNG THỨ 2 TT –  phuongnam2929 11-07-16 09:19 PM

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