英文数、符号、公式、图形表达

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1、ReadingofNumbers,SignsandFormulas一、NumbersComplexnumbers:real～,imaginary～;rational～,irrational～;interger～,decimals(recurringandterminating)orfractions(properandimproper);1.Decimals‥0.37(zero)pointthreeseven,threesevenrecurring(zero)pointthreesevenrepetendthreeseven0:rea

2、ds[ou],zero,ornought.2.FractionsGenerally:eightandtwooverthreetwothirdstwodividedbythreeSpecially:1/2a[one]half1/3a[one]third1/4a[one]quarterPercent[PerCent]andPermille[Permille]25%twentyfivepercent25‰twentyfivepermille3.PrefixsPrefixsymbolvaluechinesenameteraT垓，千京，兆兆6g

3、igaG京，千兆megaM兆kilok千hectoh百deca(deka)da十dicid分centic厘millim毫micro微nanon纤，纳picop沙，毫纤，皮fetof尘，毫沙，飞attoa渺，毫尘，阿二、Signs1.EqualityandInequality＝beequalto≠benotequaltoequalsdoesnotequal≡beidenticallyequaltobeidenticalto[with]beequivalentto≈beapproximatelyequalto,approximatelye

4、quals△becorrespondingto6＜belessthan＞begreaterthan≤belessthanorequalto≥begreaterthanorequalto《befar[much]lessthan》befar[much]greaterthanbeindirectproportiontobeininverseproportionto2.Positiveandnegativeetc.＋:positive[plus]±:plusorminuspositiveornegative－:negative[minus]m

5、axf(x):maximumvalueoff(x)minf(x):minimumvalueoff(x):asubn∞:Infinity:totendto,toapproach∵because∴therefore∥beparallelto⊥beperpendicular0oC:zerodegreecentigrade[Celsius]32oF:thirtytwodegreeFahrenheit66’sixminutes,sixfeet.6’’sixseconds,sixinches∠A:angleA.3.Grouping():round

6、brackets,Parentheses[Parenthesis单数](a+b):open[left]roundbracketaplusbclose[right]roundbracket.[]:squarebrackets.｛｝:Braces.〈〉:Anglebracketsa∈A:aisamemberofsetA.AB:AisasubsetofB.AiscontainedinB.A∪B:unionofsetsAandB.A∩B:intersectionofsetsAandB.4.Operation＋:plus－:minus×:tim

7、es÷:over[dividedby]和sum差difference积product商quotient余数remainder:absolutevalueofAn!:nfactorialsummationofssubnfromnequalsonetofiveProductofasubnfromnequalsonetoinfinitythelimitofSsubnasntendstoinfinity(approachesinfinity,gets6arbitrarilylarge)A×B:vectorproductofAandB.A·B:

8、scalarproductofAandB.5.Function:xtothenthpowerxtothepowerofnespecially:xsquared,xsquare,xtothesecondpower:xcub