x+y |
z |
x+z |
y |
y+z |
x |
(x+y)(y+z)(z+x) |
xyz |
(x+y)(y+z)(z+x) |
xyz |
2z?2x?2y |
xyz |
2a |
a+1 |
2 |
a+1 |
pq |
2r |
2p |
r2 |
1 |
2q |
1 |
a |
1 |
b |
a+b |
ab |
1 |
1+a4 |
1 |
1+b4 |
1 |
1+c4 |
1 |
1+x4 |
1 |
1+y4 |
1 |
1+z4 |
1 |
x |
1 |
y |
A.x+y | B.
| C.
| D.
|
1 |
2008 |
1 |
2007 |
1 |
2006 |
1 |
2 |
x2 |
1+x2 |
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