lim |
n→∞ |
a(1+2+…n) |
2n2-5n+3 |
1 |
2 |
lim |
n→∞ |
a(1+2+3+…+n) |
2n2-5n+3 |
lim |
n→∞ |
a•
| ||
2n2-5n+3 |
lim |
n→∞ |
| ||||
2n2-5n+3 |
a |
4 |
1 |
2 |
A.若
| ||||||||||
B.若数列{an},{bn}的极限都不存在,则{an+bn}的极限也不存在 | ||||||||||
C.若数列{an},{an+bn}的极限都存在,则{bn}的极限也存在 | ||||||||||
D.设Sn=a1+a2+…an,若数列{an}的极限存在,则数列{Sn}的极限也存在 |
1 |
3 |
A.1 | B.
| C.1或
| D.4 |
lnx+a |
x |
1+lnx |
x |
A.x=1 | B.y=x-1 | C.y=1 | D.y=-1 |
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