[Đại 9]: Cực trị!!!

E

eye_smile

x−1−22−x+3x−1+22−x+3=1−42−xx−1+22−x+3\dfrac{\sqrt{x-1}-2\sqrt{2-x}+3}{\sqrt{x-1}+2\sqrt{2-x}+3}=1-\dfrac{4\sqrt{2-x}}{\sqrt{x-1}+2\sqrt{2-x}+3} \leq 11
Dấu "=" xảy ra \Leftrightarrow x=2x=2
 
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