1-x |
x-3 |
A.{x|x<3} | B.{x|x>3或x<1} | C.{x|x>3} | D.{x|1<x<3} |
1-x |
x-3 |
A.不等式x2≥4的解集为{x|x≥±2} | ||||
B.不等式x2-9<0的解集为{x|x<3} | ||||
C.不等式(x-1)2<2的解集为{x|1-
| ||||
D.设x1,x2为ax2+bx+c=0的两个实根,且x1<x2,则不等式ax2+bx+c<0的解集为{x|x1<x<x2} |
A.
| ||
B.
| ||
C.
| ||
D.
|
4 |
6+x-x2 |
A.(-5,1) | B.(-1,5) | C.(-∞,-5)∪(1,+∞) | D.(-∞,-1)∪(5,+∞) |
1 |
a |
A.(a,
| B.(
| C.(-∞,a)∪(
| D.(-∞,
|
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