题目
题型:单选题难度:一般来源:不详
3+x+x2 |
1+x |
A.2
| B.-1+2
| C.-1-2
| D.-2+2
|
答案
3+x+x2 |
1+x |
3 |
1+x |
3 |
x+1 |
≥2
3 |
3 |
1+x |
3 |
函数y=
3+x+x2 |
1+x |
3 |
故选B.
核心考点
举一反三
|
5 |
4 |
(1)求常数c的值;
(2)求使f(x)>
| ||
8 |
3+x+x2 |
1+x |
A.2
| B.-1+2
| C.-1-2
| D.-2+2
|
3+x+x2 |
1+x |
3 |
1+x |
3 |
x+1 |
3 |
3 |
1+x |
3 |
3+x+x2 |
1+x |
3 |
|
5 |
4 |
| ||
8 |