M
motminhdidem


1.CMR: $x^5+x+1=0$ có nghiệm duy nhất là :
$x=\frac{1}{3}(1-\sqrt[3]{\frac{25+\sqrt{621}}{2}}-\sqrt[3]{\frac{25-\sqrt{621}}{2}})$[/B]
2. Cho:
a) $x=\sqrt[3]{\sqrt{2}-1} -1-\frac{1}{\sqrt[3]{\sqrt{2}-1}}$
Tính $P=(x+1)^3+3x+2$
$x=\frac{1}{3}(1-\sqrt[3]{\frac{25+\sqrt{621}}{2}}-\sqrt[3]{\frac{25-\sqrt{621}}{2}})$[/B]
2. Cho:
a) $x=\sqrt[3]{\sqrt{2}-1} -1-\frac{1}{\sqrt[3]{\sqrt{2}-1}}$
Tính $P=(x+1)^3+3x+2$
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