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Programa que realiza la tabla de multiplicar del 5 y del 8

<meta charset="UTF-8">

<script>
    var num = 5;
    document.write("<h3>Tabla del " + num + "</h3>");
    document.write(num + " * 1 = " + num * 1 + "<br>");
    document.write(num + " * 2 = " + num * 2 + "<br>");
    document.write(num + " * 3 = " + num * 3 + "<br>");
    document.write(num + " * 4 = " + num * 4 + "<br>");
    document.write(num + " * 5 = " + num * 5 + "<br>");
    document.write(num + " * 6 = " + num * 6 + "<br>");
    document.write(num + " * 7 = " + num * 7 + "<br>");
    document.write(num + " * 8 = " + num * 8 + "<br>");
    document.write(num + " * 9 = " + num * 9 + "<br>");
    document.write(num + " * 10 = " + num * 10 + "<br>");
    document.write("<br><br>");

    num = 8;

    document.write("<h3>Tabla del " + num + "</h3>");
    document.write(num + " * 1 = " + num * 1 + "<br>");
    document.write(num + " * 2 = " + num * 2 + "<br>");
    document.write(num + " * 3 = " + num * 3 + "<br>");
    document.write(num + " * 4 = " + num * 4 + "<br>");
    document.write(num + " * 5 = " + num * 5 + "<br>");
    document.write(num + " * 6 = " + num * 6 + "<br>");
    document.write(num + " * 7 = " + num * 7 + "<br>");
    document.write(num + " * 8 = " + num * 8 + "<br>");
    document.write(num + " * 9 = " + num * 9 + "<br>");
    document.write(num + " * 10 = " + num * 10 + "<br>");
</script>