求比值:35:105 39:65 54:27 3/4:6 0.9:3.6 7.2:1.8 18:6/7 2/3:6/7 3/4:6

问题描述:

求比值:35:105 39:65 54:27 3/4:6 0.9:3.6 7.2:1.8 18:6/7 2/3:6/7 3/4:6