数学符号英语表示法.ppt

前缀前缀符号符号数值数值中文名称中文名称例词例词tera-T1012兆兆（亿万）giga-G109千兆（十亿）gigahertz(GHz)10kHz1GHz meg(a)-M106兆 megohmmeter,megohertz(MHz)kilo-k103千 kilometer(km)kilovolt(kV)kilowatt(kW)kilogram(kg）hecto-h102百 hectogram,deca-da101十 decameterdeci-d10-1分（十分之一）decimetercenti-c10-2厘 centimeter(cm)milli-m10-3毫 milliampere（mA）milliammeter micro-10-6微 microfarad（F）nano-n10-9纳 nanometer (nm)pico-p10-12微微 picocoulomb(pC),picofarad(pF)femto-f10-15毫微微atto-a10-18微微微2)小数，分数，百分数Symbol and Formula0.1:zero point one,point one,o point one,one tenth,decimal one 0.01:point zero one,10.35:ten point three five1/2:a(one)half 1/3:a third1/4:one quarter 1/8:a eighth2/3:two-thirds,two over three,two divided by three3/4:three-fourths,three quarters3%:three percent0.2%:point two percent5:five per mill3)幂（power）根（root）x to the second power 2.4 Symbol and Formula:x square,x squared,the square of x,the second power of x,y to the third power:y cube,y cubed,the cube of y,the third power of y,:the nth power of a,a to the n power:the square root o f three:the cube(third)root of a:the nth root of a 2.4 Symbol and Formula4)数学运算符号A+BA and B,A plus B A-BA minus BABA times B,A multiplied by BABA over B,A divided by BABA plus or minus BA=BA equals B,a equals to b,a is equal to bABA is not equal to B,A is not BABA is approximately equal to BABA is greater than BABA is greater than BABA is much(far)greater than BABA is much less than BABA is greater than or equal to B.ABA is less than or equal to B.ABA is proportion to b,a varies directly as bA:BA to B2.4 Symbol and Formula2.4 Symbol and Formula