Since direct "Download PDF" buttons are rare on these sites due to copyright, you can use these methods to keep a copy on your PC:
Support for didactic materials (Didakticheskie Materialy) associated with major textbooks like Dorofeev. Since direct "Download PDF" buttons are rare on
Often used as an alternative to GDZ.ru, this site provides a mobile-friendly interface that works equally well on desktops for checking homework for various math levels. How to "Save" These Solutions to Your Computer Since direct "Download PDF" buttons are rare on
Many solutions on GDZ.ru include commentary to help students understand the logic rather than just copying answers. Since direct "Download PDF" buttons are rare on