IMO 2020 Shortlist A3
Suppose that a, b, c, d are positive real numbers satisfying pa cqpbdq “ ac bd. Find the smallest possible value of a b ...
Category: Algebra
Problem
Suppose that a, b, c, d are positive real numbers satisfying pa cqpbdq “ ac bd. Find the smallest possible value of a b
b
c
c d
d
a
.
(Israel)