MgL1AL\frac{\mathrm{MgL}_{1}}{\mathrm{AL}}ALMgL1
MgLAL1\frac{\mathrm{MgL}}{\mathrm{AL}_{1}}AL1MgL
MgL A( L1−L)\frac{\mathrm{MgL}}{\mathrm{~A}\left(\mathrm{~L}_{1}-\mathrm{L}\right)} A( L1−L)MgL
Mg( L1−L)AL\frac{\mathrm{Mg}\left(\mathrm{~L}_{1}-\mathrm{L}\right)}{\mathrm{AL}}ALMg( L1−L)