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use strict;
use warnings;
...
a/b
b+c
c*a/(b+a)

Eval of $hash{a}/$hash{b} failed:
   Illegal division by zero at (eval 10)[noname.pl:10] line 1, <DATA> 
+line 1.

$hash{b}+$hash{c} = 3
$hash{c}*$hash{a}/($hash{b}+$hash{a}) = 3