1 |
x |
1 |
y |
2x-3xy+2y |
x+2xy+y |
1 |
x |
1 |
y |
x+y |
xy |
2x-3xy+2y |
x+2xy+y |
2(x+y)-3xy |
x+y+2xy |
7xy |
7xy |
2xy |
x+y |
1 |
a2-b2 |
yz |
y+z |
1 |
a2 |
2xz |
x+z |
1 |
a2+b2 |
xyz |
xy+yz+zx |
1 |
10 |
x |
y |
2 |
7 |
x2-3xy+2y2 |
2x2-3xy+7y2 |
A.
| B.
| C.
| D.
|
2 |
a |
1 |
b |
2a+b |
a-b |
A.-5 | B.5 | C.-4 | D.4 |
5x |
x-2y |
A.缩小2倍 | B.缩小5倍 | C.缩小10倍 | D.不变 |
-a |
m-n |
A.
| B.
| C.
| D.-
|
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