题目内容
lim |
x→1 |
2 |
x2-1 |
1 |
x-1 |
A.-1 | B.-
| C.
| D.1 |
lim |
x→1 |
2 |
x2-1 |
1 |
x-1 |
=
lim |
x→1 |
1-x |
x2-1 |
=
lim |
x→1 |
-1 |
x+1 |
=-
1 |
2 |
故选B.
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题目内容
lim |
x→1 |
2 |
x2-1 |
1 |
x-1 |
A.-1 | B.-
| C.
| D.1 |
lim |
x→1 |
2 |
x2-1 |
1 |
x-1 |
lim |
x→1 |
1-x |
x2-1 |
lim |
x→1 |
-1 |
x+1 |
1 |
2 |