( ) ( ) 3 2. 2 ( ) ( ) x ( ) x 6 _________ __________ 6( ) 0 1 ( ) ( ) 0 4

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( ) ( )  3                        2.     2  ( ) ( ) 
x        ( )                             x          6
    _________                       __________
       6( ) 0  1                             ( ) ( ) 0 4  

943X7=6601

234X6=1404

3 3 3 3 3 -3 3 3 3 3, 3 3 3（ 3, ..3 -3 3, 3