  In our preceeding reports, we have pointed out that a unified description of
weak decays accompanying neutrinos and the oscillation process is obtained on
the basis of the expectation values of flavor-neutrino numbers with respect to
the neutrino-source hadron state. In the present report, we investigate the
effect on the expectation values due to the deviation from Fermi's golden
relation, and give concrete features of these deviations in the case of $\pi^+$
and $K^+$-decays under the simple situation with the $3$-momentum $\vec{p_A}=0$
for $A=\pi^+$, $K^+$. %numerical results under simple situations.
