Question

reduce the fraction -20t^5u^2v^3/48t^7u4v

Answer 1

lets reduce the fraction step by step if needed:
-20t^5u^2v^3/48t^7u^4v
= -5 v^2/12 t^2u^2
that is, the exponents were:
t = 5 - 7 = -2 that is below
u = 2 - 4 = -2 that is below
v = 3 - 1 = 2 that is upper