Question

1)-5,1a-4b-4,9a+b 2) 7,5x+y-8,5x-3,5y

Answer 1

Вроде бы так ссссссссссссссссссс

Answer 2

It seems like you've provided two sets of expressions. It's not entirely clear what you want to do with them. Are you looking to simplify these expressions, solve equations, or perform some other operation? Please provide more context or specify what you'd like to do with these expressions so that I can assist you further.