Can I omit these positions? or what would be the best way to put them on a resume?

The year 2010 was scattered with work that really didn't last i had jobs any where from 1 week to 1 month before I got a job I was at for 6 months before having to leave for scheduling issues with school. I don't bother putting the 1 week on a resume because it was only a week and the company went through a layoff right after I was hired, before that I left a position at the end of 3 week training because it wasn't what I was told the job would be, but i left my previous job that i was there for a year with for them. There was one that was a seasonal position for 1 month. can I omit all of those extremely short positions between march to october?