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:
答
7.5:1/2 1.25::5/8 250克:2/5千克 x:24/7=0.875:5
=7.5除以1/2 =5/4:5/8 =250:400 5x=24/7*7/8
=7.5*2 =10:5 =5:8 5x=3
=15 =2:1 x=3除以5
x=3/5
答
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