Question

2а³в - 5ав³ - 7а³в + ав³

Answer 1

вот так я решила лумаю что правильно

Answer 2

It seems like you've provided an expression with variables "а" and "в." However, you haven't specified what you would like to do with this expression. Are you looking to simplify, factor, solve, or perform some other operation? Please provide more context or clarify your question so I can assist you accurately.