Resposta :
difícil essa , segue minha resolução
lim x->1 Vx - 1 / V2x+3 - V5=
lim x->1 (x - 1).(V2x+3 + V5)/(2x-2).(Vx + 1) =
lim x->1 (x - 1).(V2x+3 + V5)/2.(x-1).(Vx + 1) =
lim x->1 (V2x+3 + V5)/2.(Vx + 1) = 2V5/4
lim x->1 Vx - 1 / V2x+3 - V5=
lim x->1 (x - 1).(V2x+3 + V5)/(2x-2).(Vx + 1) =
lim x->1 (x - 1).(V2x+3 + V5)/2.(x-1).(Vx + 1) =
lim x->1 (V2x+3 + V5)/2.(Vx + 1) = 2V5/4