428x64十572x65简便方法

如题所述

428x64十572x65
=428×65+572×65-428×1
=65×(428+572)-428
=65×1000-428
=65000-428
=64572
温馨提示:答案为网友推荐,仅供参考
第1个回答  2016-04-30
解: 428x64十572x65
=428x64十572x64+572
=64x(428十572)+572
=64x1000+572
=64000+572
=64572
第2个回答  2016-04-30
428×65用简便的方法428x65=214x2x65=214x130=214x100+214x30=21400+6420=27820