x2 |
2 |
x3 |
3 |
x4 |
4 |
x2012 |
2012 |
x2013 |
2013 |
A.3 | B.4 | C.5 | D.6 |
x2 |
2 |
x3 |
3 |
x4 |
4 |
x2012 |
2012 |
x2013 |
2013 |
1+x2013 |
1+x |
1+x2013 |
1+x |
x2 |
2 |
x3 |
3 |
x4 |
4 |
x5 |
5 |
x2012 |
2012 |
x2013 |
2013 |
x2 |
2 |
x3 |
3 |
x4 |
4 |
x2012 |
2012 |
x2013 |
2013 |
A.a≥0 | B.-1≤a<0 |
C.a>0或-1<a<0 | D.a≥-1 |
1 |
3 |
A.恒为负值 | B.等于0 | C.恒为正值 | D.不大于0 |
A.至少有三个实数根 | B.至少有两个实数根 |
C.有且只有一个实数根 | D.无实数根 |