Bai1: Dung ghi d sai ghi s
a) 4,5:5*2=4,2:10 b) 4,5:5*2=0,84*2 c) 3,6:15:3=3,6:5 d) 3,6:15:3=0,24:3
=0,42 =1,68 =0,72 =0,08
bai2: so dan huyen A hang nam tang 1,2%.Biet rang cuoi nam 2006 huyen A co 125 000 nguoi.Hoi den cuoi nam 2008 so dan huyen A la bao nhieu nguoi?