x2 |
1+x2 |
12 |
1+12 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
(
| ||
1+(
|
1 |
5 |
1 |
2 |
1 |
3 |
1 |
n |
12 |
1+12 |
1 |
2 |
1 |
2 |
(
| ||
1+(
|
1 |
5 |
22 |
1+22 |
4 |
5 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
2 |
1 |
x-1 |
x |
x-1 |
A.0 | B.1 | C.-1 | D.x |
(m-n)2 |
m+n |
2xy |
x2-y2 |
y |
x-y |
9 |
4 |
a2-4 |
2 |
a+2 |
1 |
a-2 |
A.增多 | B.减少 |
C.不变 | D.增多、减少都有可能 |
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