g2-常用符号与数学表达式

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1、Chapter2专业英语中常用符号和数学表达式1．数的分类complexnumber复数zero;naught;0零realnumber实数imaginarynumber虚数relationalnumber有理数irrationalnumber无理数integernumber整数positiveintegernumber正整数naturalnumber自然数negativeintegernumber负整数fraction分数decimal小数oddnumber奇数evennumber偶数cardinalnumber基数ordinalnumber序数approximatenumber近

2、似数significantnumber有效数2．整数addition加法subtraction减法addend加数subtrahend减数augend被加数minuend被减数plussign加号minussign减号sum和difference（diffa）差plus;add;and;increase加minus;subtract;decrease减is;equal等division除法multiplication乘法divide除multiply;multipliedby;times乘divisor除数multiplier乘数dividend被除数multiplicand被乘数q

3、uotient商product积remainder余数positive正negative负3．小数和分数numerator分子denominator分母decimalpoint小数点naughtpointfour零点四fractionstroke分数线recurringdecimal循环小数4．百分数percent百分比permill千分比average平均数roundoff舍入discount折扣interest利息5．幂与指数power幂;乘方root-extracting开方exponent指数logarithms对数Xsquared某数的平方cube三次方threecubed

4、三次方的four乘四次方cuberoot立方根squareroot平方根torisetothepoweroffive使乘五次方radicalsign根号6．代数algebra代数equation等式;方程式inequality不等式unknownnumber未知数absolutevalue绝对值simpleequation一次方程quadraticequation二次方程cubicequation三次方程monomial单项式polynomial多项式variable变量coefficient系数differential微分integral积分derivative导数function

5、函数ratio比proportion比例signofequality等号signofinequality不等号interval区间matrix矩阵theorem定理lemma引理definition定义7．常用数学表达式数值1/2ahalf;onehalfl/3athird;onethird2/3twothirds1/4aquarter;onequarter;afourth;onefourthl/100a(one)hundredthl/1,000a(one)thousandth113/324onehundredandthirteenoverthreehundredandtwenty-

6、fourfourandtwo-thirdsforty-fiveandeighty-nineovertwenty-three0.1onetenth;pointone0.01onehundredth;pointzeroone0.001onethousandth;pointzerozeroone;pointtwozeroone2050.0357twothousandandfiftypointzerothreefiveseven0.25zeropointtwofivepointtwofiverepetendfivezeropointtwofiverecurringzeropointthree

7、seventwenty-fiverecurring对483579四舍五入到千位roundoff483579tonearestthousand108onefollowedbyeighteenzeros-30.8negativethirtypointeight2-3itwominusthreei;twominusthreetimesi2％twopercent;twopercent5‰fivepermill;fivepermill∞infinity实数x＋y＝z