four-and-a-half是多少啊?

four-and-a-half是多少啊? four and one-half million kilograms 是多少? 什么时候用half a 什么时候用a half?It takes half an hourIt weighs four and a half kilograms four and a half minutes（啥意思） 翻译I'm about four and a half feet tall. It took us___to get there大神们帮帮忙A.fours and a half hours B.four and a half hour C.four and a half hours D.a half hours and four half of them and a half是多少 3/4? seventeen and a half million 是多少 25 and a half million阿拉伯数字是多少? Four years old at home,Two and a Half in Buses and Trains短文翻译 four and one half meters 怎么翻译? I am four years old at home,and two and a half in a bus and a train. it took him four and a half years to walk around the world 改为同义句 Why is the boy four years old at home but two and a half on buses? one and a half 请问“seven and a half thousand”到底是多少?晕了. one and a half million 是多少?为什么如题 4点半是“a half past four还是“half past four快