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bfphucspears93


Cho em hỏi 4 bài này làm sao vậy thầy.
1/ [TEX]3log_3(1-\sqrt{x}+\sqrt[3]{x}) = 2log_2(\sqrt{x})[/TEX]
2/ [TEX]log_{2\sqrt{2+\sqrt{3}}}(x^2 - 2x - 2) = log_{2+\sqrt{3}}(x^2 - 2x -3)[/TEX]
3/ [TEX]log^2_3(x + 2) + 4(x + 2)log_3(x+2) - 16 = 0[/TEX]
4/ [TEX](x+1)log^2_{\frac{1}{2}}x+(2x+5)log_{\frac{1}{2}}x + 6 \geq 0[/TEX]
Em xin cám ơn.
1/ [TEX]3log_3(1-\sqrt{x}+\sqrt[3]{x}) = 2log_2(\sqrt{x})[/TEX]
2/ [TEX]log_{2\sqrt{2+\sqrt{3}}}(x^2 - 2x - 2) = log_{2+\sqrt{3}}(x^2 - 2x -3)[/TEX]
3/ [TEX]log^2_3(x + 2) + 4(x + 2)log_3(x+2) - 16 = 0[/TEX]
4/ [TEX](x+1)log^2_{\frac{1}{2}}x+(2x+5)log_{\frac{1}{2}}x + 6 \geq 0[/TEX]
Em xin cám ơn.
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