常用英文数学式/符号的读法（二）

         二、一些函数关系的读法

  A与B的乘积 the ___ product of A and B

（___中填乘积的性质，例如外积就填outer，内积就填inner)

A乘以B A times B or A is multiplied by B

  A/B A over B B分之A的最普通读法

  f(x) f of x 函数f(x)

  exp(n) e to powers of n e的n次幂

          三、 Pronunciation of Numerals 数词的读法

　     1.Cardinals and Ordinals 基数和序数

(1)100以内的数词

基数 序数

Roman Arabic

Numerals Numerals

罗马数字 阿拉伯数字 读法 数码 读法

I 1 one 1st the first

II 2 two 2nd the second

III 3 three 3rd the third

IV 4 four 4th the fourth

V 5 five 5th the fifth

VI 6 six 6th the sixth

VII 7 seven 7th the seventh

VIII 8 eight 8th the eighth

IX 9 nine 9th the ninth

X 10 ten 10th the tenth

XI 11 eleven 11th the eleventh

XII 12 twelve 12th the twelfth

XIII 13 thirteen 13th the thirteenth

XIV 14 fourteen 14th the fourteenth

XV 15 fifteen 15th the fifteenth

XVI 16 sixteen 16th the sixteenth

XVII 17 seventeen 17th the seventeenth

XVIII 18 eighteen 18th the eighteenth

XIX 19 nineteen 19th the nineteenth

XX 20 twenty 20th the twentieth

XXI 21 twenty-one 21st the twenty-first

XXV 25 twenty-five 25th the twenty-fifth

XXX 30 thirty 30th the thirtieth

XL 40 forty 40th the fortieth

L 50 fifty 50th the fiftieth

LX 60 sixty 60th the sixtieth

LXX 70 seventy 70th the seventieth

LXXX 80 eighty 80th the eightieth

XC 90 ninety 90th the ninetieth

IC 99 ninety-nine 99th the ninety-ninth

C 100 one hundred 100th the hundredth

CII 102 a hundred 102nd the (one) hundred

and two and second

246 two hundred and forty-six

751 seven hundred and fifty-one

(2)1000以上的数词

1,000 = one thousand 一千

10,000 = ten thousand 一万

100,000 = one hundred thousand 十万

1,000,000 = one million 一百万

10,000,000 = ten million 一千万

100,000,000=one hundred million 一亿

(3)十亿以上的大数，英美有不同的读法：

英国 美国

十亿 one thousand million = one billion

百亿 ten thousand million = ten billion

千亿 one hundred thousand million = one hundred billion

万亿 one billion = one trillion

2.Fractions 分数

通常将分子读为基数，将分母读为序数。

1/2 = a (or one) half

1/3 = a (or one) third

1/4 = a quarter or one fouth

1/5 = a (or one) fifth

2/3 = two thirds

9/10 = nine tenths

53/4 = five and three quarters

15/64= fifteen over (or by) sixty-four

15% = fifteen per cent

4‰ = four per mill

3.Decimals 小数

0.4 = zero (or nought) point four

.01 = point (or decimal) nought one

12.34 = twelve point three four

567.809 = five hundred and sixty-seven point eight nought nine

30.45 = thirty point four five, five recurring

0.3% = decimal three percent