If we define \otimes(a, b, c) by
\otimes(a, b, c)=\frac{\max (a, b, c)-\min (a, b, c)}{a+b+c-\min (a, b, c)-\max (a, b, c)},
compute \otimes(\otimes(7,1,3), \otimes(-3,-4,2), 1).
If we define \otimes(a, b, c) by
\otimes(a, b, c)=\frac{\max (a, b, c)-\min (a, b, c)}{a+b+c-\min (a, b, c)-\max (a, b, c)},
compute \otimes(\otimes(7,1,3), \otimes(-3,-4,2), 1).