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$\begin{array}{c}A+A\\ 1+1\\ 1+1\end{array}$

Source Code:

    <math> 
      <mtable> 
        <mtr> 
          <mtd> 
            <mrow> 
              <mi color='#f00'>A</mi> 
              <mo>+</mo> 
              <mi color='#0000ff'>A</mi> 
            </mrow> 
          </mtd> 
        </mtr> 
        <mtr> 
          <mtd> 
            <mrow> 
              <mn mathcolor='#f00'>1</mn> 
              <mo>+</mo> 
              <mn mathcolor='#0000ff'>1</mn> 
            </mrow> 
          </mtd> 
        </mtr> 
        <mtr> 
          <mtd> 
            <mrow> 
              <mn mathbackground='#f00'>1</mn> 
              <mo>+</mo> 
              <mn mathbackground='#0000ff'>1</mn> 
            </mrow> 
          </mtd> 
        </mtr> 
      </mtable> 
    </math>