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A A A + 1 + 2 + 3 1 + 2 + 3

Source Code:

    <math> 
      <mrow> 
        <mi>A</mi> 
        <mphantom> 
          <mi>A</mi> 
        </mphantom> 
        <mi>A</mi> 
        <mo>+</mo> 
        <mfrac> 
          <mrow> 
            <mn>1</mn> 
            <mo>+</mo> 
            <mn>2</mn> 
            <mo>+</mo> 
            <mn>3</mn> 
          </mrow> 
          <mrow> 
            <mn>1</mn> 
            <mo>+</mo> 
            <mphantom> 
              <mn>2</mn> 
              <mo>+</mo> 
            </mphantom> 
            <mn>3</mn> 
          </mrow> 
        </mfrac> 
      </mrow> 
    </math>