既然.book{padding:44px 15px 15px }中间一个15px 已经定义了五个图片组成的div整体，左右的内边距都为15px。那为什么得到的结果只是左边距15px而最右边空出许多？
代码如下：
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>一米生活</title>
<style type="text/css">
img{margin:10px 18px;border:2px solid #FF0000}
.content{border:4px solid #badbdb}
.book{background:url(../53a94bf20001d3d000000000/%E7%BD%91%E9%A1%B5%E5%B8%83%E5%B1%80%E5%9F%BA%E7%A1%80/case2/images/t_book.gif) no-repeat;padding:45px 15px 50px;#baddbd;width:700px}
</style>
</head>
<body>
<div class="content book">
<img src="../53a94bf20001d3d000000000/网页布局基础/case2/images/book1.jpg" width="80";height="80" />
<img src="../53a94bf20001d3d000000000/网页布局基础/case2/images/book2.jpg" width="80";height="80" />
<img src="../53a94bf20001d3d000000000/网页布局基础/case2/images/book3.jpg" width="80";height="80" />
<img src="../53a94bf20001d3d000000000/网页布局基础/case2/images/book4.jpg" width="80";height="80" />
<img src="../53a94bf20001d3d000000000/网页布局基础/case2/images/book5.jpg" width="80";height="80" />
</div>
</body>
</html>
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