2×1000 | ||||
|
2xy |
x+y |
1000x+1000y |
2×1000 |
x+y |
2 |
x+y |
2 |
2xy |
x+y |
(x+y)2-2xy |
2(x+y) |
x2+y2 |
2(x+y) |
1 |
a |
1 |
b |
2 |
a+b |
ab |
a2-b2 |
x-2 |
2x-1 |
1.5 |
1-2x |
1 |
x+1 |
x2-2x+1 |
x2-1 |
x-1 |
x+1 |
m-a |
n-a |
A.
| B.
| ||||
C.
| D.以上答案都不对 |
1 |
2 |
1 |
2 |
2 |
3 |
2 |
3 |
3 |
4 |
3 |
4 |
2012 |
2013 |
x-y |
x |
2xy-y2 |
x |
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