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parenthesesfractionsmathml

Fraction including parentheses in MathmL

How can I make the fraction like the second formula?

my sample formula

  <math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>D</mi><mi>e</mi></msub><mo>=</mo><mrow><mn>1</mn><mo>,</mo><mn>3</mn></mrow><mi>&middot;</mi><mfrac><mfenced><msup><mrow><mi>a</mi><mo>&middot;</mo><mi>b</mi></mrow><mn>0,625</mn></msup></mfenced><msup><mfenced><mrow><mi>a</mi><mo mathsize="small">+</mo><mi>b</mi></mrow></mfenced><mn>0,25</mn></msup></mfrac><mtext>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [m]</mtext><mtext mathcolor="DodgerBlue"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Formel 1.3</mtext>
    </math>
Solution 
  • <math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
<msub><mi>D</mi><mi>e</mi></msub>
<mo>=</mo>
<mn>1,3</mn>
<mo>.</mo>
<mfrac>
<mrow><mo stretchy="false" form="prefix">(</mo><mi>a</mi><mo>.</mo><mi>b</mi><msup><mo stretchy="false" form="postfix">)</mo><mn>0,625</mn></msup></mrow>
<mrow><mo stretchy="false" form="prefix">(</mo><mi>a</mi><mo>+</mo><mi>b</mi><msup><mo stretchy="false" form="postfix">)</mo><mn>0,25</mn></msup></mrow>
</mfrac>
</mrow>
</math>