a |
b |
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|
|
A.(-∞,2
| B.[0,
| C.[-
| D.[2
|
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|
|
2x+3x |
x2+1+4+9x2 |
x |
2x2+1 |
1 | ||
|
1 | ||
2
|
| ||
4 |
| ||
2 |
| ||||
|
|
| ||
4 |
1-2008x |
A.(-∞,0] | B.[0,+∞) | C.(-∞,0) | D.(-∞,+∞) |
A.最大值-2,最小值-18 | B.最大值-6,最小值-18 |
C.最大值-6,最小值-11 | D.最大值-2,最小值-11 |
A.y=x+x-1 | B.y=3x+3-x | C.y=
| D.y=x4+2x2+3 |
log2(x-1) | ||
|
A.(1,2] | B.(1,2) | C.(2,+∞) | D.(-∞,2) |
1 |
2 |
A.[
| B.[1,2] | C.[
| D.[2,+∞) |
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