简便计算急!急!急!计算这几道题：64/65×4 - 知识问答

简便计算急!急!急!计算这几道题：64/65×47 2009×89/2008 3又3/5×25又2/5+37.9×6又

1个回答

64/65×47
=(1-1/65 )×47
=47-47/65
=46又18/65
2009×89/2008
=（2008+1）×(89/2008)
=89+89/2008
=89又89/2008
3又3/5×25又2/5+37.9×6又2/5
=3.6×25.4+37.9×6.4
= 91.44+242.56
=334

相关问题