|
x2+x+4 |
x |
(-x2)-(-x)+4 |
(-x) |
x2+x+4 |
x |
x2-x+4 |
x |
(-x2)+(-x)+4 |
(-x) |
x2-x+4 |
x |
x2+x+4 |
x |
4 |
x |
x2-x1 |
x1•x2 |
x2+x+4 |
x |
4 |
x |
4 |
x2 |
4 |
x2 |
4 |
x2 |
4 |
x2 |
4 |
x2 |
A.2 | B.-2 |
C.0 | D.随a的取值而变化 |
x+a |
x+2 |
5 |
4 |
A.y=log2(1-x) | B.y=1-x2 | C.y=2x | D.y=-(x+1)2 |
A.[
| B.[2,+∞) | C.(0,2] | D.[-
|
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