1 ( ) ( )× 4 5 -------------------------( ) ( ) ( )( ) 0 8-------------------------( ) ( ) ( ) 0两种方法.

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1()()×45-------------------------()()()()08-------------------------()()()0两种方法.1()()×45------------

1 ( ) ( )× 4 5 -------------------------( ) ( ) ( )( ) 0 8-------------------------( ) ( ) ( ) 0两种方法.
1 ( ) ( )
× 4 5
-------------------------
( ) ( ) ( )
( ) 0 8
-------------------------
( ) ( ) ( ) 0
两种方法.

1 ( ) ( )× 4 5 -------------------------( ) ( ) ( )( ) 0 8-------------------------( ) ( ) ( ) 0两种方法.
152
* 45
-------
760
608
-------
6840