12.2 可分离变量的微分方程与一阶线性微分方程

1,
)
(
lim
)
(
lim
2
0
0
=
+
=
+
+
→
→
x
Ce
e
x
f
x
x
x
x
0,
)
(
lim 2
0
=
+
+
→
x
x
x
Ce
e
1.
0
1 −
+
=
+ C
C
1).
(
)
( −
=
x
x
e
x
e
x
f