Question 52
Let $a$, $b$, $c$ and $d$ be real numbers with $a \lt b \lt c \lt d$.
Sort the numbers $x = a b + c d$, $y = b c + a d$ and $z = c a + b d$ in ascending order and prove the correctness of your result.
Sort the numbers $x = a b + c d$, $y = b c + a d$ and $z = c a + b d$ in ascending order and prove the correctness of your result.