annotate sum many record

Hi, i used django 1.11 and try used annotate

i have model with 3 decimal fields i would like sum 2 and multiply for other field but with aritmetic calculation

i have used this query

(1) total = Model.objects.annotate(all=Sum(F('fieldA') + F('fieldB') * F('fieldC')))

but this return queryset with all calculation i have 3 record in db
print total  
and return this

<QuerySet [<Model: Model object>, <Model: Model object>, <Model: Model object>]>

then I do a forloop with for to do the sum

for x in total:

    variable += x.all 

it is possible to return the sum of the 3 registers with the annotate in a single line, 

as (1)total queryset

How could I do that?

thank for yours helps

--

att.

Carlos Rocha

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