можно так   http://docs.google.com/viewer?a=v&q=cache:aknKyK0V9yYJ:school12-ug.narod.ru/DswMedia/priemyiobucheniyaresheniyuzadach.ppt+school12-ug.narod.ru/.../priemyiobucheniyaresheniyuzadach.ppt&hl=ru&gl=cz&pid=bl&srcid=ADGEESgdAB5wi7L5zo0ZyUemQAVKujIlCA5WjKmq-KC_SYdRxeWa93rQosJSEN-DPTKVEAe64K-TogY26FICEA02-OnYzcHbGXUmmBzjbfA7WKttAokHS1AZNs9JnitgXDaKOY1yaKQW&sig=AHIEtbQwI5woryIXoaVxIx3KGzPm_d127A