some link

http://hotfile.com/dl/115249020/cef9d42/formulas_geometry.pdf.html

http://hotfile.com/dl/115249130/0c7261e/High_School_Mathematics.pdf.html

http://www.ebook3000.com/250-Problems-in-Elementary-Number-Theory_115575.html

http://hotfile.com/dl/115249386/5d42ef8/problemListAcm.txt.html