郑州骨科医院图片:这道题用简便算法,怎么算呀。
来源:百度文库 编辑:中科新闻网 时间:2024/05/15 04:47:13
48/49×48
48/49X(49-1)
=48+48/49
=48又48/49
=48*(49+1)
=48*50
=2400
48/49*48
=(1-1/49)*48
=48-48/49
=47又1/49
=2304/49
(49-1)*(49-1)/49=
(49*49-2*49+1)/49=
49-2+1/49=
47+1/49
48/49X(49-1)
=48+48/49
=48又48/49