B
boomber


giải pt sau:
1/ [TEX]x^2-3x+1 = -\frac{\sqrt{3}}{3}\sqrt{x^4+x^2+1}[/TEX]
2/ [TEX]x^2+3\sqrt{x^2-1} = \sqrt{x^4-x^2+1}[/TEX]
1/ [TEX]x^2-3x+1 = -\frac{\sqrt{3}}{3}\sqrt{x^4+x^2+1}[/TEX]
2/ [TEX]x^2+3\sqrt{x^2-1} = \sqrt{x^4-x^2+1}[/TEX]