4.?代数式，方程，不等式　　algebraicterm代数项?liketerms,similarterms同类项?numericalcoefficient数字系数literalcoefficient字母系数?inequality不等式triangleinequality三角不等式range值域originalequation原方程?equivalentequation同解方程，等价方程?linearequation线*方程(e.g.5x+6=22)?　　5.?分数，小数　　properfraction真分数?improperfraction假分数?mixednumber带分数?vulgarfraction，commonfraction普通分数?simplefraction简分数?complexfraction繁分数numerator分子?denominator分母?(least)commondenominator（最小）公分母quarter四分之一?decimalfraction纯小数?infinitedecimal无穷小数?recurringdecimal循环小数?tenthsunit十分位??　　56.集合　　union并集?propersubset真子集?solutionset解集?　　7.?数列　　arithmeticprogression(sequence)等差数列?geometricprogression(sequence)等比数列?　　8.?其它?　　approximate近似?(anti)clockwise(逆)顺时针方向?cardinal基数?ordinal序数?directproportion正比?distinct不同的?estimation估计，近似?parentheses括号?proportion比例?permutation排列?combination组合?table表格?trigonometricfunction三角函数unit单位,位?　　几何GEOMETRY　　1.角　　alternateangle内错角?correspondingangle同位角?verticalangle对顶角?centralangle圆心角?interiorangle内角?exteriorangle外角?supplementaryangles补角complementaryangle余角?adjacentangle邻角acuteangle锐角?obtuseangle钝角rightangle直角?roundangle周角?straightangle平角?includedangle夹角