求比值7.5:1/2,化简比1.25:5/8,250克:2/5千克,解比例x:24/7=0.875:

问题描述:

求比值7.5:1/2,化简比1.25:5/8,250克:2/5千克,解比例x:24/7=0.875:

比值7.5:1/2=7.5×2=15
化简比1.25:5/8=5/4:5/8=2:1
250克:2/5千克=250:400=5:8
解比例x:24/7=0.875:5
5x=24/7×7/8
5x=3
x=3/5