9x |
9x+3 |
1 |
k |
2 |
k |
3 |
k |
k-1 |
k |
1 |
4 |
3 |
4 |
9x |
9x+3 |
91-x |
91-x+3 |
9x |
9x+3 |
3 |
9x+3 |
1 |
k |
2 |
k |
3 |
k |
k-1 |
k |
k-1 |
k |
k-2 |
k |
k-3 |
k |
1 |
k |
k-1 |
2 |
k-1 |
2 |
A.f(3)•f(5)≥0 |
B.函数在点(-4,f(-4))处的切线斜率k1<0 |
C.f(-3)>f(-5) |
D.函数在点(4,f(4))处的切线斜率k2≥0 |
|
9 |
8 |
|
1 |
f(2) |
A.
| B.-
| C.
| D.18 |
A.必是增函数 | B.必是减函数 |
C.是增函数或是减函数 | D.无法确定增减性 |
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