化简比:0.3:3分之1 求比值:7分之3:0.25 45分:1.5小时

问题描述:

化简比:0.3:3分之1 求比值:7分之3:0.25 45分:1.5小时

解0.3:1/3
=3:10/3
=3×3:10/3×3
=9:10
7分之3:0.25
=3/7:1/4
=3/7÷1/4
=3/7×4
=12/7
45分:1.5小时
=45分:90分
=45:90
=1:2
=0.5