Cho 3 số thực dương $a, b, c$ sao cho $a^{2}+ b^{2}+ c^{2}+ abc= 4$. CM: $a+ b+ c\geq \sqrt{a}+ \sqrt{b}+ \sqrt{c}$
$a+ b+ c\geq \sqrt{a}+ \sqrt{b}+ \sqrt{c}$
Started By dai101001000, 30-03-2018 - 19:05
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