Attachments are considered children of the post they’re attached to, so this should work:
$images=get_children( array('post_parent'=>$post->ID,
'post_mime_type'=>'image',
'numberposts'=>1));
echo wp_get_attachment_image($images[0]->ID, 'large');
for a large image… replace “large” with the size definition you want or a width,height array.
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