one and half 还是 one and a half比如一个半月（1.5个月）

one and half还是one and a half one and a half hours 还是hour one and a half 英语翻译是one and a half hours还是one and half an hours还是其他? half的用法是 one and a half years 还是one and a half year?half具体的用法? 是one and a half hours还是one and a half hour 是one and half hours还是one and half hour?RTRT! one and a half hours还是one and a half hour one and a half hours?还是one and a half hour? 是one and a half hour 还是 one and a half hours 一个半小时 英语：是one and a half hour 还是 one and a half hours one and half a minute’s还是one and half a minutes’ one and half 还是 one and a half比如一个半月（1.5个月） 一天半 的英文是one and a half days还是one and half days 那1.5 是one and a half 还是one and half一天半可以译为one day and a half吗 half past one可以表示时间1:30吗,还是one hour and a half one and one half billion 是多少? what’s one third and one half one-and-one-half 是不是两层半