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 1 4又4/5:3又3/7

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 1 4又4/5:3又3/7

341 :209 =31:19 (约分掉11)=31/19
3/20:7/45 =3/20X45/7=3/4X9/7=27/28
11/12:5/24=11/12X24/5=11X2/5=22/5
6又1/2:2/5=13/2X5/2=65/4
56:84 =2:3(约分掉28)=2/3
465:375 =31:25(约分掉15)=31/15
14又4/5:3又3/7=74/5X7/24=37/5X7/12=259/60不对,从新做对的,哪个不对请指出,不对的话你看看你自己题目写清楚没有