<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<script type="text/javascript">
function tong(a,b)
{
a=parseInt(a);
b=parseInt(b);
document.getElementById("kq").value=a+b;
}
function hieu(a,b)
{
a=parseInt(a);
b=parseInt(b);
document.getElementById("kq").value=a-b;
}
function tich(a,b)
{
a=parseInt(a);
b=parseInt(b);
document.getElementById("kq").value=a*b;
}
function thuong(a,b)
{
a=parseInt(a);
b=parseInt(b);
document.getElementById("kq").value=a/b;
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post">
<p>
<label for="so1">Số 1::</label>
<input type="text" name="so1" id="so1">
</p>
<p>
<label for="so2">Số 2::</label>
<input type="text" name="so2" id="so2">
</p>
<p>
<label for="kq">Kết quả::</label>
<input type="text" name="kq" id="kq" disabled>
</p>
<p>
<input type="button" name="tinhtong" id="tinhtong" value="Tính Tổng" onClick="tong(so1.value,so2.value)">
<input type="button" name="tinhhieu" id="tinhhieu" value="Tính Hiệu" onClick="hieu(so1.value,so2.value)">
<input type="button" name="nhan" id="nhan" value="Tích" onClick="tich(so1.value,so2.value)">
<input type="button" name="chia" id="chia" value="Thương" onClick="thuong(so1.value,so2.value)">
</p>
</form>
</body>
</html>
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