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1、大额数字的英文念法250000念成Twohundredandfiftythousand大额数字每三位一读，从小到大为：thousand,million,billion.拿到一个数字，首先从个位开始数出位数，四位为thousand，七位为million，十位为billion。心里有数了之后，读的时候要从大位开始。比如：2，567，000首先知道这个数是7位，读的时候以2million开始，后面每三位就按照平时读法，之后再加上thousand，就好了。所以读成：twomillionfivehundredandsixty-seventhousand.1,000a/onethousand1,000,
2、000a/onemillion1,000,000,000a/onebillion(美athousandmillion)我们中文是4位4位分（万、亿）英语是3位3位分（千、百万、十亿）习惯了就好了数学英文表达3tothefourth数学mathematics，maths公理axiom定理theorem计算calculation运算operation证明prove假设hypothesis,hypotheses(pl.)命题proposition定理theorem定义defination算术arithmetic数字digit数number自然数naturalnumber整数integer小数dec
3、imal小数点decimalpoint分数fraction分子numerator分母denominator加plus(prep.),add(v.),addition(n.)被加数augend,summand加数addend和sum减minus(prep.),subtract(v.),subtraction(n.)被减数minuend减数subtrahend差remainder,difference乘times(prep.),multiply(v.),multiplication(n.)被乘数multiplicand,faciend乘数multiplicator积product除divided
4、by(prep.),divide(v.),division(n.)被除数dividend除数divisor商quotient等于equals,isequalto大于greaterthan小于lessthan大于等于equalorgreaterthan小于等于equalorlessthan运算符operator比ratio正positive负negative零null,zero,nought,nil十进制decimalsystem二进制binarysystem十六进制hexadecimalsystem权weight,significance进位carry截尾truncation四舍五入roun
5、d下舍入rounddown上舍入roundup有效数字significantfigure代数algebra公式formula,formulae(pl.)单项式monomial多项式polynomial,multinomial系数coefficient未知数unknown等式，方程式equation一次方程linearequation二次方程quadraticequation三次方程cubicequation四次方程quarticequation不等式inequality阶乘factorial对数logarithm指数，幂exponent乘方power二次方，平方square三次方，立方cub
6、e四次方thepoweroffour,thefourthpowern次方thepowerofn,thenthpower开方evolution,extraction二次方根，平方根squareroot三次方根，立方根cuberoot四次方根therootoffour,thefourthrootn次方根therootofn,thenthroot集合set元素element空集emptyset子集subset交集intersection并集union补集complement映射mapping函数function定义域domain值域range常量constant变量variable单调性monot
7、onicity奇偶性parity周期性periodicity图象image数列，级数series,sequence微积分calculus微分differentiation导数derivative极限limit无穷infinite(a.)infinity(n.)积分integral定积分definiteintegral不定积分indefiniteintegral有理数rationalnumber无理数irrat
