Expression 3: "x" equals StartFraction, "z" StartNestedFraction, "f" NestedOver "f" minus "n" , EndNestedFraction positive StartNestedFraction, "f" "n" NestedOver "n" minus "f" , EndNestedFraction Over "z" , EndFractionx=zff−n+fnn−fz
3
Expression 4: "x" equals StartFraction, negative "z" StartNestedFraction, "n" NestedOver "f" minus "n" , EndNestedFraction plus StartNestedFraction, "f" "n" NestedOver "f" minus "n" , EndNestedFraction Over "z" , EndFractionx=−znf−n+fnf−nz