<html>
<head>
<title>Problema</title>
</head>
<body>
<form action="pagina2.php"
method="post">
Ingrese primer valor:
<input type="text" name="valor1">
<br>
Ingrese segundo valor:
<input type="text" name="valor2">
<br>
<select name="operacion">
<option value="suma">sumar</option>
<option value="resta">restar</option>
</select>
<br>
<input type="submit" name="operar">
</form>
</body>
</html>
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