9 |
12 |
3 |
4 |
3x2-3 |
x2-x |
3(x+1)(x-1) |
x(x-1) |
3(x+1) |
x |
x2-x |
3x2-3 |
x |
3(x+1) |
3x2-3 |
x2+2x+1 |
3(x-1) |
x+1 |
x2+2x+1 |
3x2-3 |
x+1 |
x(x-1) |
x2+2x-3 |
x2-1 |
A.1或-1 | B.-3或1 | C.-3 | D.-3或-1 |
x2-x-6 |
x2-3x+2 |
A.3或-2 | B.3 | C.-2 | D.-3或2 |
1 | ||
|
|
| ||
|
| ||
1-
|
A.x≥2且x≠3 | B.x≥1 | C.x>2且x≠3 | D.x≥2 |
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