How to hide the first image in a WP post?

Question

Images

In a wordpress post, I need to hide the first image after the thumbnail. They all have the same class except for the miniature.

<div class="entry-content ">
<img class="hide_img" src="1.jpg"/>
<img class="hide_img" src="2.jpg"/>
<img class="hide_img" src="3.jpg"/>
</div>

You need to hide only the first image in all posts.
tried like this:

.entry-content  .first_img_hide:first-child{
display:none!important;
}

but style removes all images. How to be?