Expression 39: "M" Subscript, 1 , Baseline equals StartFraction, "m" Subscript, 1 , Baseline "L" Subscript, 1 , Baseline minus "L" Subscript, 2 , Baseline plus StartNestedFraction, 1 NestedOver "m" Subscript, 2 , Baseline , EndNestedFraction "K" Subscript, 1 , Baseline plus "K" Subscript, 2 , Baseline Over "m" Subscript, 1 , Baseline plus StartNestedFraction, 1 NestedOver "m" Subscript, 2 , Baseline , EndNestedFraction , EndFractionM1=m1L1−L2+1m2K1+K2m1+1m2