357+299怎么简便算
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![357+299怎么简便算](/uploads/image/z/3893041-1-1.jpg?t=357%2B299%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%E7%AE%97)
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357+299怎么简便算
357+299怎么简便算
357+299怎么简便算
357+299
=357+(300-1)
=357+300-1
=657-1
=656
357+299=357+300-1=657-1=656
357+300-1=657-1=656
357+299=357+(300—1)
=357+300-1
=657-1
=656