以下三道题该怎样巧算?要求过程。
1个回答
展开全部
1847-64-136+628-1928=1847-(64+136)+(628-1928)
=1847-200-1300
=347
4993+3996+5997+848=(5000-7)+(4000-4)+(6000-3)+848
=15000-14+848
=15000+834
=15834
1348-234-131-424+1405-576+2234+1095-826-1074+1599-169-1048+2201
=(1348-1048)+(2234-234)-(131+169)-(424+576)+(1405+1095)-(826+1074)+(1599+2201)
=300+2000-300-1000+2500-1900+3800
=5400
=1847-200-1300
=347
4993+3996+5997+848=(5000-7)+(4000-4)+(6000-3)+848
=15000-14+848
=15000+834
=15834
1348-234-131-424+1405-576+2234+1095-826-1074+1599-169-1048+2201
=(1348-1048)+(2234-234)-(131+169)-(424+576)+(1405+1095)-(826+1074)+(1599+2201)
=300+2000-300-1000+2500-1900+3800
=5400
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