357+299怎么简便算
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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=656357+299=357+300-1=657-1=6
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