<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div style="border: 1px solid red; width: 1000px;margin: 0px auto" >
<div style="border: 1px solid red;">
<div style="border: 1px solid red;width: 500px;height: 400px;float: left"></div>
<div style="border: 1px solid red;width: 492px;height: 400px;float: right">
<div style="border: 1px solid red;width: 49%;height: 49%"></div>
<div style="border: 1px solid red;width: 49%;height: 49%"></div>
<div style="clear: both"></div>
</div>
</div>
<div style="border: 1px solid red;">
<div style="border: 1px solid red;height: 200px;width: 30%;float: left"></div>
<div style="border: 1px solid red;height: 200px;width: 69%;float: right"></div>
</div>
</div>
</body>
</html>
效果图：
