Tìm GTNN các bt sau:
1. $P=\sqrt[4]{\frac{a}{b+c}}\sqrt[4]{\frac{b}{c+a}}+\sqrt[4]{\frac{c}{a+b}}+\sqrt{\frac{b+c}{a}}+\sqrt{\frac{c+a}{b}}+\sqrt{\frac{a+b}{c}}$
2. $a\epsilon [-1;1]$
S=$a^5-3a^4+a^3+8a^2-14a+\frac{1}{a^3-a^2-3a+4}$
Tìm GTNN các bt sau:
1. $P=\sqrt[4]{\frac{a}{b+c}}\sqrt[4]{\frac{b}{c+a}}+\sqrt[4]{\frac{c}{a+b}}+\sqrt{\frac{b+c}{a}}+\sqrt{\frac{c+a}{b}}+\sqrt{\frac{a+b}{c}}$
2. $a\epsilon [-1;1]$
S=$a^5-3a^4+a^3+8a^2-14a+\frac{1}{a^3-a^2-3a+4}$
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