专业英语中的常用符号和数学式表达

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1、专业英语中的常用符号和数学式的表达1/2ahalf,onehalf1/3athird,onethird2/3twothirds1/4aquarter,onequarter,afourth,onefourth1/100a(one)hundredth1/1000a(one)thousandth113/324onehundredandthirteenoverthreehundredandtwentyfourfourandtwothirds0.25zero(0,naught)pointtwofive+plus,positive_minus,negative±plusorminus×multi

2、pliedby,times÷dividedby=beequalto,equals≈beapproximatelyequalto,approximatelyequals()roundbrackets;parentheses【】square(angular)brackets{}braces≤lessthanorequalto8≥morethanorequalto∞infinity∵because∴thereforemapsintoX+yxplusy(a+b)bracketaplusbbracketclosedA=baequalsb;aisequaltob;aisbA≠baisnotequ

3、altobA±baplusorminusbA≈baisapproximatelyequaltobA＞baisgreaterthanbA＞＞baismuch[far]greaterthanbA

4、re;xsquared;thesquareofx;thesecondpowerofx;xtosecondpower:xcube;xcubed;thecubeofx;thethirdpowerofx;xtothethirdpowerthesquarerootofxthecuberootofx%percent2%twopercent‰permill5‰fivepermilllogxtothebasenlogxtothebase10;commonlogarithm,logxtothebasee;naturallogarithm;napierianlogarithm,exponentialf

5、unctionofx;etothepowerxthenthpowerofx;xtothepowern或thenthrootofx;xtothepoweroneovernSinsineCoscosineTg,tantangentCtg,cotcotangent8Sc,secsecontCsc,cosescosecant,arcsin:arcsine,arcos:arccosineSinh:thehyperbolicsineCosh:thehyperboliccosine∑:thesummationof:thesummationofxsubI,whereIgoesfrom1ton∏:th

6、eproductof:theabsolutevalueofx:themeanvalueofx;xbar:bprime:bdoubleprime;bsecondprime:btripleprime:functionfofx∧；finitedifferenceorincrement:theincrementofx:deex;deeofx;differentialx:thedifferentialcoefficientofywithrespecttox;thefirstderivativeofywithrespectofx8:thesecondderivativeofywithrespec

7、tofx:thenthderivativeofywithrespectofx:thepartialderivativeofywithrespectofu,whereyisafunctionofuandanothervariable(orvariables):integralof:doubleintegralof:n-foldintegralof:integralbetweenlimitsaandb(…fromatob):vectorF：asubtwo20°