| 5 | ||
lim | ||
| 2n−√4n2−3n+2 |
| (2n+√4n2−3n+2) | ||
* | ||
| (2n+√4n2−3n+2) |
| a | a(b+√c | a(b+√c) | |||
= | = | ||||
| b−√c | (b−√c)(b+√c) | b2 − |c| |
| a(b+√c) | |
| b2−c |
| 5 | 5 | |||||||||
an = | = | = | ||||||||
| 2n −√ 4 n2 −3 n +2 |
|
| 5*(2 n + √4n2 − 3n +2) | 5*( 2+√4 −3n +2n2) | |||
= | = | |||
| 3n − 2 | 3 −2n |
| 5* (2 + 2) | 20 | |||
lim an = | = | |||
| 3 | 3 |
| a2 − b2 | ||
a − b = | ||
| a + b |