55×28×25用简便计算该怎么算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/22 06:44:04
55×28×25用简便计算该怎么算
该怎么算
该怎么算
=55X7X4X25
=55X7X100
=38500
再问: 402×389
再答: =(400+2)X389 =400X389+2X389 =155600+778 =156378
再问: 163×56×125呢?
再答: 163X7X8X125 =1141X1000 =1141000
=55X7X100
=38500
再问: 402×389
再答: =(400+2)X389 =400X389+2X389 =155600+778 =156378
再问: 163×56×125呢?
再答: 163X7X8X125 =1141X1000 =1141000