x |
3 |
y |
4 |
z |
2 |
x-2y+3z |
x-3y-z |
x |
3 |
y |
4 |
z |
2 |
x-2y+3z |
x-3y-z |
3k-8k+6k |
3k-12k-2k |
k |
-11k |
1 |
11 |
1 |
11 |
a2bc |
ab |
x2-4 |
x2-4x+4 |
2x-2 |
1-x2 |
(a+1)2 |
1-a2 |
a+2 |
a2-4 |
1 |
( ) |
-x-y |
-x+y |
x+y |
( ) |
1 |
x+2 |
x-3 |
x2-x-6 |
A.x≠-2 | B.x≠-2且x≠3 | C.x≠3 | D.以上都不对 |
n-1 |
n+1 |
A.
| B.
| C.-1 | D.-
|
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