四年级数学寒假•简便运算归类
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简介
第一类：加法 65+73+135 =65+135+73 =200+73 =273 357+288+143 =357+143+288 =500+288 =788 272+68+28 =272+28+68 =300+68 =368 129+235+171+165 =129+171+235+165 =300+400 =700 17+145+23+35 =17+23+145+35 =40+180 =220 999+99+9+3 =999+1+99+1+9+1 =1000+100+10 =1110
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