1 |
2008 |
1 |
2007 |
1 |
2006 |
1 |
2 |
x2 |
1+x2 |
x2 |
1+x2 |
a2 |
1+a2 |
1 |
a |
x2 |
1+x2 |
| ||
1+
|
1 |
1+a2 |
a2 |
1+a2 |
1 |
1+a2 |
1 |
2008 |
1 |
2007 |
1 |
2006 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
x |
y+z |
y |
z+x |
z |
x+y |
a |
1+a |
b |
1+b |
c |
1+c |
A.
| B.
| ||||||||
C.
| D.
|
a |
b |
b |
a |
a2+ab+b2 |
a2+4ab+b2 |
1 |
a+1 |
1 |
b+1 |
1 |
2 |
a |
(a+1)2 |
1 |
(a+1)2 |
A.
| B.
| C.
| D.
|
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