Skip to content / Đến nội dung
ThichHocToan.com

USAJMO 2018 Question 2

USAJMO · USAJMO 2018

Question 2

Let $a,b,c\gt 0$ satisfy $a+b+c=4\sqrt[3]{abc}$. Prove that

$$2(ab+bc+ca)+4\min(a^2,b^2,c^2)\ge a^2+b^2+c^2.$$

Proposed by Titu Andreescu.