latest posts from diferents categories

Hi, i am trying to put in the homepage of my blog the latest post from 3 categories, in 3 areas of the page.
working with a same code like this.

<?php
$myposts = get_posts(‘numberposts=1&offset=0&category=1’);
foreach($myposts as $post) :
?>
• “><?php the_title(); ?> — <?php the_excerpt(); ?>

<?php endforeach; ?>

3 times in the same page, only the firts with category=1, the next category=3, and category=5,

but the same content appears on the 3.

how can i do this, please help..
regards.