http://econtent.edu.mn/book/1rangi 1. МАТЕМАТИК http://econtent.edu.mn/content/1rangi/mat/index.html 2. МОНГОЛ ХЭЛ http://econtent.edu.mn/content/1rangi/monhel/index.html 3. БЭЛТГЭЛ http://econtent.edu.mn/content/1rangi/beltgel/index.html 4. ХҮН БА НИЙГЭМ http://econtent.edu.mn/content/1rangi/huno/index.html 5. ДҮРСЛЭХ УРЛАГ, ТЕХНОЛОГИ I http://econtent.edu.mn/content/1rangi/dursleh/index.html 6. ХӨГЖИМ http://econtent.edu.mn/content/1rangi/hugjim/index.html 7. ИРГЭНИЙ БОЛОВСРОЛ http://econtent.edu.mn/content/1rangi/ibol/index.html