题目内容
求下列函数的极限.(1)![]()
;
(2)![]()
;
(3)
(
+
+…+
);
(4)
(
-2n).
解:(1)![]()
=![]()
=
.
(2)![]()
=![]()
=1.
(3)
(
+
+
+…+
)
=
(1-
+
-
+
-
+…+
-
)
=
(1-
)=1.
(4)
(
-2n)
=![]()
![]()
=![]()
=
.
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题目内容
求下列函数的极限.(1)![]()
;
(2)![]()
;
(3)
(
+
+…+
);
(4)
(
-2n).
解:(1)![]()
=![]()
=
.
(2)![]()
=![]()
=1.
(3)
(
+
+
+…+
)
=
(1-
+
-
+
-
+…+
-
)
=
(1-
)=1.
(4)
(
-2n)
=![]()
![]()
=![]()
=
.