3x2-9x |
x-4 |
2x-8 |
3x-x2 |
x2-3x |
x-4 |
x-4 |
x2-3x |
x2-3x |
x-4 |
2 |
y |
2 |
3 |
x2-3x |
x-4 |
2 |
3 |
x2-3x |
x-4 |
8 |
3 |
8 |
3 |
8 |
3 |
5(x2-x) |
x2+1 |
2(x2+1) |
x2-x |
A.设x2-x=y | B.设x2+1=y | ||||
C.设
| D.设
|
3 |
x-1 |
x+3 |
x2-1 |
2 |
x |
6 |
x |
12 |
x |
n(n+1) |
x-1 |
2x+m |
x-2 |
A.5 | B.4 | C.3 | D.2 |
1 |
x |
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