Respuesta :

-20t^5u^2v^3 /48t^7U^4v
=-(20/48)(t^5/t^7)(u^2/u^4)(v^3/v)
=
-(5/12)(t^(5-7))(u^(2-4))(v^(3-1)
=-(5/12)t^(-2)u^(-2)v^2
=-(5v^2)/(12t^2u^2)

I assume you know the basic laws of exponents.  If not, please post.