新SAT数学满分攻略：高频词汇之倍数表达法

改革后的SAT数学比重占优。虽说SAT数学是人见人爱的部分，但是SAT数学满足分者却越来越少。这是为什么呢？阻碍同学们刷满分的往往只有两个因素：不认识单词和粗心。©常青藤对常见的SAT数学词汇和常见倍数表达法给大家做了整理，想要冲刺满分的同学赶紧收下。

SAT数学高频单词abscissa 横坐标absolute value **值account for (数量)占acute angle 锐角acute triangle 锐角三角形addition 加，加法adjacent 相邻adjacent angles 邻角algebra 代数学algebraic expression 代数式algebraic fraction 分式aliquant 除不尽数alternate angles 内错角altitude 高度apiece 每人，每个approximately 近似的，大约的approximation 近似，近似值arc 弧，圆周的任意一段area 面积arithmetic 算术arithmetic(al) average 算术平均数arithmetic(al) mean 算术平均数或等差中项at random 随机地at right angles with 与……成直角be composed of 由构成be equal to 与……相等be equivalent to anther equation 与另一方程痛解be fewer than 小于be greater than 大于be greater than or equal to 不小于be inscribed in 内接于be less than 小于be perpendicular to 垂直于calculate to three decimal places 计算结果保留三位小数cancellation 约掉，消掉common difference 等差数列的公差留学common ratio 等比数列的公比common multiple 公倍数complement 余角complementary angle 余角complete quadratic (equation) 全二次方程complex fraction 繁分数composite number 和数，指大于一而不是质数的整数compound 混合物;decimal place 小数位decimal point 小数点decrease 减少，degree 度;度数(温度和角度)denominator 分母equality 相等，等式equation 等式，方程equiangular 等角的equidistance 等距离的even integer 偶数geometric mean 几何平均数geometric progression 几何级数，等比级数greatest common divisor 公约数halve 把……平分为二;将……减半hexagon 六边形horizontally 水平地hundreds 百位hundredth 第一百个;百分之一hypotenuse (直角三角形)斜边radical 根号，根式;radius 半径randomly 随机地rate 率，比率;速度，速率;价格，费用ratio 比rectangular 矩形的;成直角的reduce 减少、缩小regular 规则的;定期的;匀称的;常规的remainder 余数remote interior angles 三角形一个外角对应的两个内错角repeating decimal 无限循环小数rhombus 菱形right 直的root 方根;方程的根round 四舍五入satisfy 使……成立scale drawing按比例绘制(的图)scalene 不等边三角形，不等边的secant 割线section 断面，一部分cross section横截面segment 弓形;shaded region 阴影simple annual interest 年单利simultaneous equations 联立方程组slopewww.njsdy.com (直线的)斜率solid 立体;立体的;实心的sphere 球体square 正方形straight angle 平角，指180度的角straight-line distance 直线距离subdivide 再分，细分such that 使得满足…的条件surface area 表面积X-axis X轴X-coordinate X坐标XY-coordinate system 平面直角坐标系，同XY-planeY-axis Y轴Y-coordinate Y坐标

SAT数学词汇之倍数表达法(一)用 times 表示倍数(一般限于包括基数在内三倍或三倍以上的数。表示两倍的数，一般用 twice )。其句式有：1. “… times +形容词 / 副词的比较级+ than …”例如：Line AB is three times longer than line CD.线段 AB 是(线段) CD 的三倍长。This hall is five times bigger than our classroom.这个大厅比我们的教室大 5 倍。2. “… times+ as + 形容词 / 副词的原级+ as …”例如：This table is three times as long as that one.这张桌子是那张桌子的三倍长。This dictionary is five times as thick asthe one you borrowed from the library.这本词典的厚度是你从图书馆借的那本(厚度)的 5 倍。The plane flew ten times as high as the kite.那架飞机飞行高度是那个风筝的十倍。(高出九倍)3. “… times + the + 名词(如： size， height， weight， length， width, age等)+ of…”例如：The earth is 49 times the size of the moon.地球的体积是月球的 49 倍。This river is three times the depth of that one.这条河是那条河的三倍深。This street is four times the length of that street.这条街是那条街的四倍长。4. “… times +more +名词+ than …”例如：He earns five times more money than he did ten years ago.他现在挣的钱比十年前挣的多 5 倍。There are twice more students in our class than in theirs.我们班的学生人数比他们班多两倍。5. “… times +as many (或 much )+名词+ as …”例如：We've produced twice as much cotton this year as ( we did ) ten years ago.今年我们生产的棉花比十年前多了一倍。(汉语中的多一倍实际上也指两倍一样多。)He has got three times as many books as his sister.他拥有的书的数量是他妹妹的 3 倍。6. “… times +what 从句”例如：The length of the road is four times what it was three years ago.这条路的长度是三年前的 4 倍。The price of the meat is twice what it was last year.肉价是去年的两倍。7. “…times + up on (或 over )…”例如：The size of the sun is a million times over that ofthe earth.太阳的体积比地球的体积大一百万倍。He is three times up on your age.他的年龄是你的 4 倍(或：比你的年龄大 3 倍)。8. “… +by + …times ”例如：Compared with last year, our coal output has increased by three times.与去年相比，我们的煤产量增长了 3 倍。His speed is faster than mine by four times.他的速度比我的快 4 倍。9. “… times +compared with +被比较对象”例如：The number of the students in our school has increased four timescompared with 1980.我们学校的学生人数比 1980 年增加了4倍。10. “… times +that of + 被比较对象”例如：In this workshop the output of July was three times that of January.这个车间七月份的产量是元月份的 3 倍。(二)用分数、百分数表示倍数。例如：The box is one-third bigger than that one.这个盒子比那个盒子大三分之一。Last year the output value of industry was59 percent higher than that of 1976.去年工业产值比 1976 年增长了 59 %。My command of English is not half so goodas yours.我英语掌握得还不及你的一半儿好。(三)用 again (一倍)， double (两倍)， triple (三倍)， fourfold (四倍)等词表示倍数。例如：My Aunt is as old again as I am.我姑姑的年龄比我大一倍。The top-brand clothes are often sold as double the normal price here.这里衣服的售价经常比正常的售价高一倍。The new work procedure tripled the output.新工艺使产量增加两倍。