x |
y |
y |
z |
x-z |
y+z |
x |
y |
y |
z |
80z-z |
8z+z |
79 |
9 |
88 |
9 |
88 |
9 |
A.先涨价m%,再降价n% | ||||
B.先涨价n%,再降价m% | ||||
C.先涨价
| ||||
D.先涨价
|
x2 |
x4+x2+1 |
3 |
x |
2 |
y |
2x-3y-xy |
7xy+9y-6x |
A.
| B.-
| C.-
| D.
|
x2 |
x-1 |
2x |
1-x |
x |
x-1 |
3 |
1 |
a+1 |
a+1 |
a2-2a+1 |
a+1 |
a-1 |
2 |
1 |
y |
1 |
z |
A.1 | B.2 | C.-1 | D.-2 |
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