常用数学符号英文对照

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1、常用数学符号英文对照BasicmathsymbolsSymbolSymbolNameMeaning/definitionExample=equalssignequality5=2+35isequalto2+3≠notequalsigninequality5≠45isnotequalto4≈approximatelyequalapproximationsin(0.01)≈0.01,x ≈ y means x isapproximatelyequalto y>strictinequalitygreaterthan5>45isgreaterthan4

2、sthan4<54islessthan5≥inequalitygreaterthanorequalto5≥4,x ≥ y means x isgreaterthanorequalto y≤inequalitylessthanorequalto4≤5,x≤y means x isgreaterthanorequalto y()parenthesescalculateexpressioninsidefirst2×(3+5)=16[]bracketscalculateexpressioninsidefirst[(1+2)×(1+5)]=18+plussignaddition1+1=2−mi

3、nussignsubtraction2−1=1±plus-minusbothplusandminusoperations3±5=8and-2±minus-plusbothminusandplusoperations3±5=-2and8*asteriskmultiplication2*3=614×timessignmultiplication2×3=6·multiplicationdotmultiplication2·3=6÷divisionsign/obelusdivision6÷2=3/divisionslashdivision6/2=3–horizontallinedivisio

4、n/fractionmodmoduloremaindercalculation7mod2=1.perioddecimalpoint,decimalseparator2.56=2+56/100abpowerexponent23 =8a^bcaretexponent2^3 =8√asquareroot√a · √a  =a√9 =±33√acuberoot3√a · 3√a  · 3√a  =a3√8 =24√afourthroot4√a · 4√a  · 4√a  · 4√a  =a4√16 =±2n√an-throot(radical) for n=3, n√8 =2%percent

5、1%=1/10010%×30=3‰per-mille1‰=1/1000=0.1%10‰×30=0.3ppmper-million1ppm=1/100000010ppm×30=0.0003ppbper-billion1ppb=1/100000000010ppb×30=3×10-7pptper-trillion1ppt=10-1210ppt×30=3×10-10GeometrysymbolsSymbolSymbolNameMeaning/definitionExample∠angleformedbytworays∠ABC=30°measuredangle ABC=30°spherical

6、angle AOB=30°∟rightangle=90°α=90°14°degree1turn=360°α=60°degdegree1turn=360degα=60deg′primearcminute,1°=60′α=60°59′″doubleprimearcsecond,1′=60″α=60°59′59″lineinfiniteline ABlinesegmentlinefrompointAtopointB raylinethatstartfrompointA arcarcfrompointAtopointB =60°⊥perpendicularperpendicularlines

7、(90°angle)AC ⊥ BC

8、

9、parallelparallellinesAB 

10、

11、 CD≅congruenttoequivalenceofgeometricshapesandsize∆ABC≅∆XYZ~similaritysameshapes,notsamesize∆ABC~∆XYZΔtriangletriangleshapeΔABC≅ΔBCD

12、x-y

13、distancedistancebetweenpointsxandy

14、 x-y 

15、=5πpico