n |
n2+12 |
n |
n2+22 |
n |
n2+n2 |
1 |
n |
1 | ||
1+(
|
1 | ||
1+(
|
1 | ||
1+(
|
這是函數(shù)f(x)=
1 |
1+x2 |
1 |
n |
1 |
n |
2 |
n |
n |
n |
n |
![]() |
i=1 |
1 |
n |
其中積分區(qū)間[0,1]n等分,n等分后每個(gè)小區(qū)間是[
i?1 |
n |
i |
n |
因此原式=
lim |
n→+∞ |
∫ | 10 |
dx |
1+x2 |
. |
|
π |
4 |
故選:D.
lim |
n→+∞ |
n |
n2+12 |
n |
n2+22 |
n |
n2+n2 |
π |
2 |
π |
6 |
π |
3 |
π |
4 |
n |
n2+12 |
n |
n2+22 |
n |
n2+n2 |
1 |
n |
1 | ||
1+(
|
1 | ||
1+(
|
1 | ||
1+(
|
1 |
1+x2 |
1 |
n |
1 |
n |
2 |
n |
n |
n |
n |
![]() |
i=1 |
1 |
n |
i?1 |
n |
i |
n |
lim |
n→+∞ |
∫ | 10 |
dx |
1+x2 |
. |
|
π |
4 |