化简下面各比.341 :209 3/20:7/45 11/12:5/24 6又1/2:2/5 56:84 465:375

问题描述:

化简下面各比.341 :209 3/20:7/45 11/12:5/24 6又1/2:2/5 56:84 465:375

341 :209 =11x31:11x19=31:19
3/20:7/45 =3/20x45/7=3/4x9/7=27/28=27:28
11/12:5/24 =11/12x24/5=11x2/5=22/5=22:5
6又1/2:2/5 =13/2x5/2=65/4=65:4
56:84 =2³x7:2²x3x7=2:3
465:375=3x5x31:3x5³=31:25