thầy cô giúp dùm em

N

nguyenbahiep1

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[laTEX]GTNN = \sqrt{3} \Rightarrow x = 0 [/laTEX]
 
B

braga

[TEX]\Large \blue A^2=-2x^2+6x+15-2\sqrt{(6-x)(x+2)(3-x)(x+1)} \\ A^2=\[\sqrt{(6-x)(x+1)}-\sqrt{(3-x)(x+2)}\]^2+3\ge 3 \\ \Rightarrow A\ge \sqrt{3}[/TEX]
 
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