Websites like Znanija (Brainly) or Uchi.ru often have individual problems from this textbook solved by teachers if you type in the specific text of the math problem.
Ищу ГДЗ по математике (Башмаков М.И.) для СПО gdz po matematike bashmakov n.i dlia spo
Many of the problems in the SPO book are identical to Bashmakov’s standard 10th and 11th-grade textbooks. If you can't find an "SPO" specific guide, look for the general high school one. Websites like Znanija (Brainly) or Uchi