六年级上册数学的化简下面各比怎么？

六年级数学化简7:2.82分之

(1)7:2。8 =7:(7×4×1/10) =1:40; (2)1/2:1/4 =(1/2*4):(1/4*4) =2:1; (3)0。75:0。5 =(3×0。25):(2×0。 25) =3:2; (4)9/5:3/20 =9/5×20/3 =12:1; (5)100:25 =(4×25):25 =4:1; (6)1:3/5 =1×5/3 =5:3; (7)3:0。 9 =3×10/9 =10:3; (8)11/6:22 =11/6×1/22 =1:12。全部

  (1)7:2。8 =7:(7×4×1/10) =1:40; (2)1/2:1/4 =(1/2*4):(1/4*4) =2:1; (3)0。75:0。5 =(3×0。25):(2×0。
  25) =3:2; (4)9/5:3/20 =9/5×20/3 =12:1; (5)100:25 =(4×25):25 =4:1; (6)1:3/5 =1×5/3 =5:3; (7)3:0。
  9 =3×10/9 =10:3; (8)11/6:22 =11/6×1/22 =1:12。收起