英文公式读法

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1、分数中分子用基数词表示，分母用序数词表示。先读分子，后读分母。当分子大于1时，分母要加“s”。1/2读作：onehalf1/3读作：onethird1/4读作：onefourth2/3读作：twothirds1/5/9读作：oneoverfiveninths比较复杂的分数常常用over这个词表示。如：317/509读作：threehundredandseventeenoverfivehundredandnine1/10one-tenth1/100onepercent1/1000o

2、ne-thousandth1/10000oneten-thousandth21/2twoandonehalf；42/3fourandtwo-thirds0.46%pointfoursixpercent含小数点的数字，小数点“.”读“point”，小数点后的数若是两位以上，则分别读出。0.5读作：pointfive0.25读作：pointtwofive0.125读作；pointonetwofive93.64m读作：ninety-threepointsixfourmeters2’1

3、5.11’’读作：twominutesfifteenpointoneoneseconds∵since;because因为∴hence;so所以sigma∞infinity无限大号∝variesas与…成比例mintegraloffromntom；np⇒qpimpliesqx+1xplusonex-1xminusonex±1xplusorminusonexyxy(xtimesy)x/yxovery(xdividedbyy)x=5xequalsto5x≠5xnotequalsto5xyxa

4、pproximatelyequalsyx≡yxisequivalenttoyx>yxisgreaterthanyx≥yxisgreaterthanorequaltoyx

5、x

6、modxxxapproachesinfinityx∈AxbelongstoAx∉Axd

7、oesnotbelongtoAA⊂BAiscontainedinBA⊃BAcontainsBA∩BAintersectionBA∪BAunionBx2xsquaredx3xcubedx4xtothepower4xnxtothepowernx−nxtothe(power)minusnXrootx3xcuberoot(of)x4xfourthroot(of)xnxnthroot(of)x(x+y)2xplusyallsquared(x/y)2xoveryallsquaredn!nfactorialX

8、ˆxhatXxbarX%xtildeXixi或xsubinathesumfromiequalsonetonaiii1f(x)fx/thefunctionfofxf'(x)fprimexf''(x)fdouble-primexf'''(x)ftriple-primexf(n)(x)fnth-primexffprime,subccaafirst,prime1a2asecond,secondprimezfirstderivativeofzzsecondderivativeo

9、fzdzfirstderivativeofzwithrespecttoxdxyfxyisafunctionofx∂f/∂x1partialderivativeoffwithrespecttox1∂2f/∂2xthesecondpartialderivativeoffwith1respecttox1limx→0thelimitasxapproacheszerolimx→0+thelimitasxapproacheszerofromabovelimx→0-thelimitasxapproa

10、cheszerofrombelowlogeylogytothebaseeln(y)naturallogyndfnthderivativeoffwithrespecttoxndxfxdx()anindefiniteintegralofthefunctionfxbf(x)dxintegralofthefunctionffromatobaxeexponentialfunctiontothebaseeofxlogxlogxtothebaseaalgxcommomlogarithmofx