3 |
2 |
1 |
x |
2ax2-2x+1 |
x |
1 |
2 |
1 |
2 |
x1+x2 |
2 |
3 |
2 |
3 |
2 |
x1+x2 |
2 |
1 |
2a |
1 |
2a |
1 |
2a |
1 |
2a |
1 |
2a |
1 |
2a |
3 |
2 |
1 |
2a |
1 |
2a |
3 |
2 |
3 |
2 |
3 |
2 |
3 |
2 |
1 |
2a |
3 |
2 |
3 |
2 |
1 |
2 |
a |
2 |
lim |
n→∞ |
an2-2n+1 |
bn+2 |
1 |
2 |
1 |
2 |
π |
4 |
A.[2,+∞) | B.[4,+∞) | C.(-∞,2] | D.(-∞,4] |
1 |
2 |
1 |
2 |
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