AD |
BE |
DE |
EF |
3 |
4-x |
DE |
EF |
DE |
EF |
AD |
BE |
DE |
EF |
BE |
AD |
3 |
4-x |
3 |
x |
3 |
4-x |
x |
3 |
3 |
2 |
2 |
BF |
4 |
3 |
4 |
3 |
5 |
3 |
DC |
BF |
DF |
EF |
4 |
3-x |
DF |
EF |
DE |
EF |
DC |
CF |
DE |
EF |
CF |
DC |
4 |
3-x |
4 |
x |
4 |
3-x |
x |
4 |
3 |
2 |
5 |
3 |
3 |
2 |
5 |
3 |
3 |
2 |
A.CD2=AD•DB | B.AC2=AD•AB | C.
| D.
|
A.
| B.20 | C.4
| D.
|
A.
| B.4 | C.
| D.4或
|
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