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<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>数学函数</title>
<script type="text/javascript">
var num=Math.ceil(5.2);
var num1=Math.floor(5.9);
var num2=Math.round(5.4);
var num3=Math.floor((Math.random()*10)+2);
alert(num3);
</script>
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<body>
</body>
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