mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><mfenced open="[" close="]" separators="|"><mrow><msup><mfenced separators="|"><mrow><mn>1</mn><mo>+</mo><mfrac><mn>3</mn><mn>100</mn></mfrac></mrow></mfenced><mn>2</mn></msup><mo>-</mo><mn>1</mn></mrow></mfenced></mstyle></math>