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4x+2x=6xFourxplustwoxequalssixxy=-6x^2+8x+3yequalsnegative(minus)sixxsquaredpluseightxplusthree(a+b)^2=a^2+2ab+b^2(Thequantity)aplusbsquaredequalsasquaredplustwo(times)a(times)bplusbsquared(a+b)(a-b)=a^2-b^2Aplusbtimesaminusbequalsasquaredminusbsquaredy=(4x^2+12x+9)/(2x-3)yequalsfourxsquaredplustwelvexplusninedividedbytwoxminusthree3:7=6:14threeistosevenassixistofourteen.对f(x)积分integralofafunctionofxwithrespecttoxfromxequalsatoxequalstob求和Summationfromzerotoinfinityofasubn对于分数,一般有两中说法:基数词+序数词:onethird=1/3;twofifths=2/5基数词+over+基数词:1/3=oneoverthree;2/5=twooverfive第二种特别好用,因为我们平时写分数的就是把分子写到分母的上面(over)中间用横线分隔.特别是对于复杂的分数:124/3345=onehundredandfouroverthreethousandthreehundredandforty-five