数字用英语怎么表达,尤其是次方,谁能具体的说一下呢,听说次方有2种说法,最好是给鄙人发个论文之类的那就更好了,

1. 分数表达：分子用基数词,分母用序数词.分子大于1时,分母用复数.
如：1/3 one third, 2/3 two thirds, 2 2/3 two and two-thirds
注：1/2 可用a(one) half表示,1/4 可用a(one) quarter表示,3/4可用 three-quarters表示.
2. 加减乘除的表达法：
2+3=5 Two plus three is five.
Two plus three makes/equals five.
Two plus three is equal to five.
8-3=5 Eight minus three is five
3X3=9 Three times three is nine.
8/2=4 Eight divided by two is four.
3.次方表达法：
a的2次方：a square
a的3次方： a cube
a的四次方：a to the fourth power 或 the fourth power of a
a的五次方：a to the fifth power 或 the fifth power of a
以此类推...