化简下面各比再求出比值 9分之7比15分之4 0.35比1 22.5比4.5 3分之17比9分之17 3分之2比6分之7

9分之7比15分之4
=7/9×15/4
=35:12
=35/12
0.35比1 2
=35:120
=7:24
=7/24
2.5比4.5
=25:45
=5:9
=5/9
3分之17比9分之17
=17/3×9/17
=3:1
=3
3分之2比6分之7
=2/3×6/7
=4:7
=4/7