804×25-104×125能巧算吗?
804×25-104×125能巧算吗?
日期:2022-04-03 21:14:44 人气:1
当然能巧算,巧算过程如下:
804×25-104×125
=(800+4)×25-(100+4)×125
=800×25+4×25-100×125-4×125
=20000+100-12500-500
=20100-(12500+500)
=20100-13000
=7100
804×25-104×125
=(800+4)×25-(100+4)×125
=800×25+4×25-100×125-4×125
=20000+100-12500-500
=20100-(12500+500)
=20100-13000
=7100