Ai pro giúp mình

B

bboy114crew

[tex]\sqrt{2x+4} -2\sqrt{2-x}=\frac{6x-4}{\sqrt{x^2 +4} [/tex]
8x^2 -3x +6 =4x
[tex]\sqrt{3x^2+x+2}[/QUOTE] Ta co: [tex]\sqrt{2x+4} -2\sqrt{2-x}=\frac{6x-4}{\sqrt{x^2 +4}} [/tex]
[TEX]\Leftrightarrow \frac{6x-4}{\sqrt{2x+4} -2\sqrt{2-x}}=\frac{6x-4}{\sqrt{x^2 +4}}[/TEX]
+) [TEX]6x-4=0 \Leftrightarrow x= \frac{2}{3}[/TEX]
+)[TEX]\sqrt{2x+4} -2\sqrt{2-x}=\sqrt{x^2 +4}[/TEX]
 
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