Question

13b – (9b – (8b – (6-b)))Раскройте скобки и упростите выражение:

Answer 1

$13b-(9b-(8b-(6-b)))=13b-(9b-(8b-6+b))=$

$=13b-(9b-(9b-6))=13b-(9b-9b+6)=13b-(6)=13b-6$