a+b+c |
b-a |
A.2 | B.3 | C.4 | D.5 |
b2 |
4a |
a+b+c |
b-a |
a+b+
| ||
b-a |
1+
| ||||||
|
1+
| ||||||
|
1 |
4 |
b |
a |
b |
a |
b |
a |
a+b+c |
b-a |
x2+4x+4 |
A.2x-1 | B.5 | C.1-2x | D.-5 |
A.(-∞,-2)∪(-1,+∞) | B.(-2,-1) |
C.(-∞,1)∪(2,+∞) | D.(1,2) |
A.{x|x≥6或x≤-1} | B.{x|-1≤x≤6} | C.{x|-6≤x≤1} | D.{x|x≤-6或x≥1} |
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