(382+498×381)/(382×498-116)
=[382+498×(382-1)]/(382×498-116)
=[382+498×382-498]/(382×498-116)
=[382+498×382-498]/(382×498-116)
=(382×498-116)/(382×498-116)
=1
(382+498×381)/(382×498-116)
=[382+498×(382-1)]/(382×498-116)
=[382+498×382-498]/(382×498-116)
=[382+498×382-498]/(382×498-116)
=(382×498-116)/(382×498-116)
=1