[2015 数学三]
1.设{
k
x }是数列, 下列命题中不正确的是( )
(A)若 lim
k
k
x a
→
= , 则
2 2 1
lim lim
k k
k k
x x a
+
→ →
= = .
(B)若
2 2 1
lim lim
k k
k k
x x a
+
→ →
= = , 则 lim
k
k
x a
→
=
(C) 若 lim
k
k
x a
→
= , 则
3 3 1
lim lim
k k
k k
x x a
+
→ →
= =
(D)若
3 3 1
lim lim
k k
k k
x x a
+
→ →
= = , 则 lim
k
k
x a
→
=
【答案】 D