<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Sumatorias</title>
</head>
<script type="text/javascript">
function alertit(){
var x = 0;
for ( var i=0; i < arguments.length; i++){
x += arguments[i];
}
alert('Suma'+ x);
}
</script>
<body>
<input type="button" value="Clic" onclick="alertit(10,20,30,40,50);">
</body>
</html>
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