更新时间2019-03-21 21:58:20
简便算法!
①404×25
=(400+4)×25
=400×25+4×25
=10000+100
=10100
②1200-18-382
=1200-(18+382)
=1200-400
=800
404×25
=400×25+4×25
=10000+100
=10100
1200-18-382
=1200-(18+382)
=1200400
=800
答案:404*25=(400+4)*25=400*25+4*25=10000+100=10100;1200-18-382=1200-(18+382)=1200-400=800。
①=(400+4)×25
=400×25+4×25
=10000+100
=10100
②=1200-(18+382)
=1200-400
=800