734-398用简便算法怎么算
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734-398用简便算法怎么算
734-398用简便算法怎么算
734-398用简便算法怎么算
734-398
=734-(400-2)
=734-400+2
=334+2
=336
734-398
=734+2-400
=336
734-400+2
734-398
=734-(400-2)
=734+2-400
=336
734-398
=734-(400-2)
=734-400+2
=334+2
=336
734-398-2+2=734-400+2=334-2=332
734-(400-2)=734-400+2=334+2=336
734-398=(730+4)-(400-2)=730-400+4+2=336