1 |
a |
1 |
b |
a |
2 |
1 |
a |
1 |
b |
| ||
a |
| ||
b |
1 |
2 |
b |
a |
a |
2b |
3 |
2 |
2 |
1 |
a |
1 |
b |
3 |
2 |
2 |
3 |
2 |
2 |
1 |
x |
4 |
y |
1 |
x |
4 |
y |
1 |
2 |
1 |
x |
4 |
y |
1 |
2 |
y |
x |
4x |
y |
y |
x |
4x |
y |
|
1 |
x |
4 |
y |
1 |
2 |
9 |
2 |
|
|
1 |
x |
4 |
y |
9 |
2 |
1 |
A |
9 |
B+C |
AB |
AC |
AG |
A.
| B.
| C.
| D.
|
9 |
x+1 |
a |
x |
1 |
y |
A.2 | B.4 | C.6 | D.8 |
A.ab≥
| B.ab≤1 | C.a2+b2≤2 | D.a2+b2≥3 |
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