a |
2a+4 |
b |
2b+4 |
1 |
a+2 |
1 |
b+2 |
a |
2a+4 |
b |
2b+4 |
a |
2a+ab |
b |
2b+ab |
1 |
2+b |
1 |
2+a |
1 |
a+2 |
1 |
b+2 |
x+1 |
y+1 |
x |
y |
A.正数 | B.负数 | C.零 | D.正数或负数 |
1 |
1+a |
1 |
1+b |
a |
1+a |
b |
1+b |
A.M>N | B.M<N |
C.M=N | D.M、N的大小不能确定 |
2 | ||
|
x-y | ||||
|
2xy | ||||
x
|
A.
| B.
| ||||||||||||
C.
| D.
|
1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
n(n+1) |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2009×2010 |
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