Good versions of this GDZ explain why a formula was used, rather than just outputting a digit.
"While this GDZ is highly accurate and corresponds perfectly to the problems in the Zubareva and Mordovich textbook, it can easily become a crutch. The curriculum is designed to develop logical thinking, and simply copying the ready-made solutions defeats that purpose. It is a great reference tool for parents to check their child's work quickly, but students should avoid keeping it open while doing homework." Good versions of this GDZ explain why a
The solutions match the textbook numbering perfectly, making it very easy to navigate. It saves a lot of time when reviewing difficult homework assignments in the evening." 💡 Good versions of this GDZ explain why a