<math display='block'> <mmlrow> <mmlo stretchy='false'>(</mo><mmlsub> <mmli>A</mi> <mmlrow> <mmli>A</mi><mmli>D</mi> </mrow> </msub> <mmlsub> <mmli>P</mi> <mmlrow> <mmli>a</mi><mmli>o</mi> </mrow> </msub> <mmlo>&#x2212;</mo><mmlsub> <mmli>A</mi> <mmlrow> <mmli>B</mi><mmli>C</mi> </mrow> </msub> <mmlsub> <mmli>P</mi> <mmli>v</mi> </msub> <mmlo>&#x2212;</mo><mmlsub> <mmli>F</mi> <mmlrow> <mmli>r</mi><mmli>e</mi><mmli>a</mi><mmli>c</mi> </mrow> </msub> <mmlo stretchy='false'>)</mo><mmlo>&#x2212;</mo><mmlo stretchy='false'>(</mo><mmlsub> <mmlover accent='true'> <mmli>m</mi> <mmlo>&#x02D9;</mo> </mover> <mmlrow> <mmli>B</mi><mmli>C</mi> </mrow> </msub> <mmlsub> <mmli>V</mi> <mmlrow> <mmli>B</mi><mmli>C</mi> </mrow> </msub> <mmlo>&#x2212;</mo><mmlsub> <mmlover accent='true'> <mmli>m</mi> <mmlo>&#x02D9;</mo> </mover> <mmlrow> <mmli>A</mi><mmli>D</mi> </mrow> </msub> <mmlsub> <mmli>V</mi> <mmlrow> <mmli>A</mi><mmli>D</mi> </mrow> </msub> <mmlo stretchy='false'>)</mo><mmlo>=</mo><mmli>d</mi><mmlo stretchy='false'>(</mo><mmlover> <mmli>M</mi> <mmlrow></mrow> </mover> <mmli>V</mi><mmlo stretchy='false'>)</mo><mmlo>/</mo><mmli>d</mi><mmli>t</mi> </mrow> </math>