(1)0.2=1/5=12/60
(2)4/7=12/21
(3)3/x=12/4x
分子相同,21和60之间是4的倍数的有24,28,32,36,40,44,48,52,56.即4x=24,28,32,36,40,44,48,52,56
x=6,7,8,9,10,11,12,13,14
(1)0.2=1/5=12/60
(2)4/7=12/21
(3)3/x=12/4x
分子相同,21和60之间是4的倍数的有24,28,32,36,40,44,48,52,56.即4x=24,28,32,36,40,44,48,52,56
x=6,7,8,9,10,11,12,13,14