1/2: half1/3: a third or one third1/4: a quarter, one quarter1/5: a fifth, one fifth8/5: eight over five12345 / 54321: twelve thousand the hundred and fourty five over fifty-four thousand three hundred and twenty onex/y: x over y后面3个是任何任何分数都可以这样说 前面几个特别的是有点像口语化这样另外1又1/2是 one and a half