How I can show short content with short tag

by 

function abc_the_content($num_words) {
    global $post;
    $content = $post->post_content;
    $content = strip_tags($content);
    $content = wp_trim_words($content, $num_words, $more = null);
    echo apply_filters('the_content', $content);
}

change the strip tags line to this one if you want to strip out only the img tag

    $content = preg_replace("/<\/?img(.|\s)*?>/i", '', $content);