102:68
=102÷34:68÷34
=3:2 (最简整数比)
=3/2 (比值)
4/15:4/25
=25:15 (最简整数比)
=5:3 (比值)
三分之二:0.8
=2/3:4/5
=5:6 (最简整数比)
=5/6 (比值)