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Phương trình đạo hàm giảm thiểu
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Dạng tổng quát
f
′
(
t
)
=
−
1
T
f
(
t
)
{\displaystyle f^{'}(t)=-{\frac {1}{T}}f(t)}
Nghiệm phương trình
f
(
t
)
=
A
e
−
1
T
t
{\displaystyle f(t)=Ae^{-{\frac {1}{T}}t}}
Chứng minh
f
′
(
t
)
=
−
1
T
f
(
t
)
{\displaystyle f^{'}(t)=-{\frac {1}{T}}f(t)}
d
d
t
f
(
t
)
=
−
1
T
f
(
t
)
{\displaystyle {\frac {d}{dt}}f(t)=-{\frac {1}{T}}f(t)}
∫
d
f
(
t
)
f
(
t
)
=
−
1
T
∫
d
t
{\displaystyle \int {\frac {df(t)}{f(t)}}=-{\frac {1}{T}}\int dt}
L
n
f
(
t
)
=
−
1
T
t
+
C
{\displaystyle Lnf(t)=-{\frac {1}{T}}t+C}
f
(
t
)
=
e
−
1
T
t
+
C
{\displaystyle f(t)=e^{-{\frac {1}{T}}t+C}}
f
(
t
)
=
A
e
−
1
T
t
{\displaystyle f(t)=Ae^{-{\frac {1}{T}}t}}