Respuesta :
I'm pretty sure it should be "abres el libro" if you're talking about someone else opening a book, "abren el libro" would refer to many people opening books and "abro el libro" would mean you yourself would be opening the book.
I'm pretty sure it should be "abres el libro" if you're talking about someone else opening a book, "abren el libro" would refer to many people opening books and "abro el libro" would mean you yourself would be opening the book.