x2-x-6 |
x-1 |
x2-x-6 |
x-1 |
(x-3)(x+2) |
x-1 |
2x2+2ax-a-1 |
A.{x|-1≤x≤5} | B.{x|x≥5或x≤-1} | C.{x|-1<x<5} | D.{x|x>5或x<-1} |
A.{x|x<-3或x>1} | B.{x|-3<x<1} | C.{x|x<-1或x>3} | D.{x|-1<x<3} |
A.1 | B.
| C.0 | D.-1 |
A.2x2-3x+2>0 | B.x2+4x+4≤0 |
C.4-4x-x2<0 | D.-2+3x-2x2>0 |
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