求比值 5:25 8:30 8:16 12:15 18:9 0.6:1/5
问题描述:
求比值 5:25 8:30 8:16 12:15 18:9 0.6:1/5
答
①5:25=5:(5*5)=1:5=0.2
②8:30=(2*4):(2*15)=4:15=4/15
③8:16=8:(2*8)=1:2=0.5
④12:15=(3*4):(3*5)=4:5=0.8
⑤18:9=(2*9):9=2:1=2
⑥0.6:(1/5)=0.6:0.2=6:2=3:1=3