ГДЗ по алгебре

{{~it.books_classnumber :book_classnumber:index}} {{? book_classnumber.active }} {{=book_classnumber.classnumber}} КЛАСС {{??}} {{=book_classnumber.classnumber}} КЛАСС {{?}} {{~}} {{? it.books_subject.length }}
{{~it.books_subject :book_subject:index}} {{? book_subject.active }} {{=book_subject.subject}} {{??}} {{=book_subject.subject}} {{?}} {{~}} {{?}}