<html>
<head></head>
<body>
<div>
<div style="border:1px red solid;width:10.7%;height:800px;float:left">1</div>
<div style="border:1px red solid;width:89%;height:700px;float:right">2</div>
<div style="border:1px red solid;width:89%;height:100px;float:right">3</div>
</div>
</body>
</html>
希望能帮到你