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$\begin{array}{c}A+A+A+A+A+A\\ \mathcal{A}+A+A+A\\ \mathcal{A}+A+A+A\end{array}$

Source Code:

    <math> 
      <mtable> 
        <mtr> 
          <mtd> 
            <mi> A </mi> 
            <mo>+</mo> 
            <mi fontweight='bold'>A</mi> 
            <mo> + </mo> 
            <mi fontsize='36pt'>A</mi> 
            <mo>+</mo> 
            <mi fontstyle='normal'>A</mi> 
            <mo>+</mo> 
            <mi color='#9c0fff'>A</mi> 
            <mo>+</mo> 
            <mi fontfamily='Helvetica'>A</mi> 
          </mtd> 
        </mtr> 
        <mtr> 
          <mtd> 
            <mi mathvariant='script'>A</mi> 
            <mo>+</mo> 
            <mi mathsize='36pt'>A</mi> 
            <mo>+</mo> 
            <mi mathcolor='#9c0fff'>A</mi> 
            <mo>+</mo> 
            <mi mathbackground='blue'>A</mi> 
          </mtd> 
        </mtr> 
        <mtr> 
          <mtd> 
            <mi mathvariant='script' fontweight='bold'>A 
            </mi> 
            <mo>+</mo> 
            <mi mathsize='36pt' fontsize='12pt'>A 
            </mi> 
            <mo>+</mo> 
            <mi mathcolor='#9c0fff' color='red'>A 
            </mi> 
            <mo>+</mo> 
            <mi mathbackground='blue' color='gray'>A 
            </mi> 
          </mtd> 
        </mtr> 
      </mtable> 
    </math>