<!DOCTYPE html>
<html>
<body style="font-size: 36pt; color: green">

<math style="font-family: sans-serif">
    <mo>*</mo>
    <mfenced>
        <mfrac>
            <msubsup>
                <mi>x</mi>
                <mn>1</mn>
                <mn>2</mn>
            </msubsup>
            <munderover>
                <mi>z</mi>
                <mn>3</mn>
                <mn>4</mn>
            </munderover>
        </mfrac>
    </mfenced>
</math>

</body>
</html>