0035prime_132
2024/02/11(日) 23:22:10.41ID:kz7EJAxM実数 a,b,c >0 に対して、以下の不等式が成り立つことを示せ:
(ab+bb+aa)(bb+bc+cc)(aa+cc+ca) ≧ (ab+bc+ca)^2,
IMO Long List 1990, day 1, 問77
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