|x|-2 |
x2-4 |
A.2 | B.-2 | C.±2 | D.不存在 |
|x|-2 |
x2-4 |
x2-3 | ||
x+
|
A.±
| B.
| C.-
| D.±3 |
x2-25 |
(x+5)(x-3) |
A.x=±5 | B.x=-5 | C.x=5 | D.x=3 |
x2-4 |
x2+5x-14 |
A.±2 | B.2 | C.-2 | D.-7 |
(x-1)(x+1) |
x2+2x+1 |
A.x=1 | B.x=±1 | C.x=-1 | D.x=0 |
a |
a2+1 |
a+1 |
a2-1 |
x2+1 |
x-1 |
x+1 |
x+2 |
x+1 |
x |
A.①②③④ | B.①②③ | C.①③ | D.①④ |
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