当我运行以下代码时
<html>
<head>
<script type="text/javascript">
var a=0.1;
var b=0.2;
var c=0.3;
document.write((a+b)+c);
document.write(' ');
document.write(a+(b+c));
document.write(' ');
document.write(a+b);
</script>
</head>
<body>
</body>
</html>
它向我显示了以下结果
0.6000000000000001 0.6 0.30000000000000004
我a+b=0.30000000000000004
也不明白 0.30000000000000004+0.3 怎么等于 0.6?