MathDB
China South East Mathematical Olympiad 2022 Grade11 Q5

Source: Jianxi jian

August 3, 2022
inequalitiesalgebranumber theory

Problem Statement

Let a,b,c,da,b,c,d be non-negative integers. (1)(1) If a2+b2cd2=2022,a^2+b^2-cd^2=2022 , find the minimum of a+b+c+d;a+b+c+d; (1)(1) If a2b2+cd2=2022,a^2-b^2+cd^2=2022 , find the minimum of a+b+c+d.a+b+c+d .