(52^2-37^2) (39^2-36^2)
--------------- + ---------------- =
(57^2-32^2) (45^2-30^2)
(52-37)*(52+37) (39-36)*(39+36)
---------------------- + --------------------- =
(57-32)*(57+32) (45-30)*(45+30)
15*89 3*75
-------- + -------- =
25*89 15*75
3 1 4
-- + -- = -- = 0.8
5 5 5