Маленькие хитрости в преподавании математики

Notice: memcache_connect(): Server localhost (tcp 11211, udp 0) failed with: Connection refused (61) in /usr/local/www/virtualhosts/en.edu.ru/current/web/cache/Eaze.Modules.php on line 353 Warning: memcache_connect(): Can't connect to localhost:11211, Connection refused (61) in /usr/local/www/virtualhosts/en.edu.ru/current/web/cache/Eaze.Modules.php on line 353 Маленькие хитрости в преподавании математики