数学问题
( )( )( )
* ( ) 7
-------------
( )( )( ) 3
( ) 8 ( )
_____________
( )( ) 7 ( )
参考答案:(2)(2)(9)
* (3) 7
-------------
(1)(6)(0) 3
(6) 8 (7)
_____________
(8)(4) 7 (3)
( )( )( )
* ( ) 7
-------------
( )( )( ) 3
( ) 8 ( )
_____________
( )( ) 7 ( )
参考答案:(2)(2)(9)
* (3) 7
-------------
(1)(6)(0) 3
(6) 8 (7)
_____________
(8)(4) 7 (3)