How to indicate the beginning and end of the last week in the cells?

Question

Google Sheets

for example week 23 in cells 1 07 2019 and 7 07 2019 if week 24 then 8 07 2019 and 15 07 2019 the date example is simple

Answer 1

start of week =A1-ДЕНЬНЕД(A1)+2
end of week =A1-ДЕНЬНЕД(A1)+8
for the previous -7 days:
start =A1-ДЕНЬНЕД(A1)-5
end =A1-ДЕНЬНЕД(A1)+1
The numbers depend on which day the week starts from in the date settings.