n2-mn+4 |
m-n |
A.1 | B.2 | C.4 | D.8 |
n2-mn+4 |
m-n |
4 |
m-n |
(m-n)•
|
n2-mn+4 |
m-n |
A.-4 | B.6 | C.10 | D.14 |
A.-
| B.
| C.-
| D.
|
A.{x|x≤-6或x≥1} | B.{x|x≥6或x≤-1} | C.{x|-6≤x≤1} | D.{x|-1≤x≤6} |
A.∅ | B.R | C.(1,2) | D.(-∞,1)∪(2,+∞) |
A.{x|
| B.{x|-1≤x≤-
| ||||
C.{x|x≥1,或x≤
| D.∅ |
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