*{
margin: auto;
padding: 0px;
}
#a1{
width: 100px;
height: 50px;
border: 1px solid red;
}
#a2{
width: 50px;
height: 50px;
border: 1px solid red;
}
#a3{
width: 100px;
height: 50px;
border: 1px solid red;
}
#a4{
width: 100px;
height: 50px;
border: 1px solid red;
}
#a5{
width: 100px;
height: 50px;
border: 1px solid red;
}
#a6{
width: 100px;
height: 20px;
border: 1px solid red;
}
#a7{
width: 100px;
height: 40px;
border: 1px solid red;
}
</style>
</head>
<body>
<div id="a1">
<input type="" name="b1" id="b1" value="" />
</div>
<div id="a2">
<input type="" name="b2" id="b2" value="" />
</div>
<div id="a3">
<input type="" name="b3" id="b3" value="" />
</div>
<div id="a4">
<input type="submit" name="b4" id="b4" value="计算" onclick="b8()"/>
</div>
<div id="a5">
<div id="a6">
计算结果
</div>
<div id="a7">
</div>
</div>
</body>
