M=fo×feM=f_{o} \times f_{e}M=fo×fe
M=fofeM=\frac{f_{o}}{f_{e}}M=fefo
M=fofe(1+feD)M=\frac{f_{o}}{f_{e}}\left(1+\frac{f_{e}}{D}\right)M=fefo(1+Dfe)
M=ffc(1+f0D)M=\frac{f_{}}{f_{c}}\left(1+\frac{f_{0}}{D}\right)M=fcf(1+Df0)
