mml=<math xmlns="http://www.w3.org/1998/Math/MathML"><mstyle mathsize="12px"><msup><mfenced><mrow><mn>9</mn><mi mathvariant="normal">x</mi><mo>-</mo><mi mathvariant="normal">y</mi><mo>+</mo><mfrac><mi mathvariant="normal">z</mi><mn>3</mn></mfrac></mrow></mfenced><mn>2</mn></msup></mstyle></math>