x |
2 |
y |
3 |
z |
4 |
x+3y-z |
2x-y+z |
x |
2 |
y |
3 |
z |
4 |
x+3y-z |
2x-y+z |
2k+9k-4k |
4k-3k+4k |
7k |
5k |
7 |
5 |
x+3y-z |
2x-y+z |
7 |
5 |
1 |
x-1 |
A.
| B.
| ||||||||
C.
| D.
|
30b |
27a |
y2-x2 |
x+y |
y2+x2 |
x+y |
m2 |
m |
2x+3 |
x-3 |
0.2x-0.012 |
-x-0.05 |
x2+xy+y2 |
2xy-x2 |
A.-
| B.-
| C.1 | D.无法确定 |
A.
| B.
| ||||||||
C.
| D.
|
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