拿一根绳子,对折后再对折,这时的每一折绳子占这根绳子的.
18: =0.25= %= ÷24=.
2.5==50÷ = ÷50.
6: = %=0.25= ÷48= (填分数)
4÷5= = = = ÷80.
甲数和乙数的比是3:7,甲数就是乙数的. .