数独(三）

_ _ _ 7 _ _ _ _ _
_ 6 1 _ _ _ _ _ _
_ _ _ 3 2 _ _ 5 _

_ _ _ _ _ _ _ _ 8
2 _ _ _ 5 _ _ _ _
_ _ _ _ _ 1 9 _ 6

_ _ _ _ _ _ _ _ _
3 _ _ _ _ 2 _ 7 _
_ 9 _ _ 6 8 _ _ _

*--------------------------------------------------------------------------------------------*
| 5 3 2| 7 1 9| 6 8 4|
| 7 6 1| 4 8 5| 2 9 3|
| 9 4 8| 3 2 6| 7 5 1|
|------------------------------+------------------------------+------------------------------|
| 6 1 3| 2 9 7| 5 4 8|
| 2 8 9| 6 5 4| 3 1 7|
| 4 7 5| 8 3 1| 9 2 6|
|------------------------------+------------------------------+------------------------------|
| 8 2 4| 9 7 3| 1 6 5|