GMAT考试1-GMAT数学12月总结(十二)
<p> 261. <span word="The">The</span> <span word="center">center</span> <span word="of">of</span> <span word="a">a</span> <span word="circle">circle</span> <span word="at">at</span> ,<span word="the">the</span> <span word="distance">distance</span> <span word="of">of</span> <span word="the">the</span> <span word="two">two</span> <span word="points">points</span> <span word="on">on</span> <span word="x">x</span> <span word="axis">axis</span> <span word="where">where</span> <span word="the">the</span> <span word="circle">circle</span> <span word="intersect">intersect</span> <span word="is">is</span> 8, <span word="whats">whats</span> <span word="the">the</span> <span word="circumference">circumference</span></p><p> 262.长方形<span word="ABCD">ABCD</span>，<span word="AB">AB</span>长6，<span word="BC">BC</span>长9。<span word="P">P</span>是<span word="DA">DA</span>上任意一点。问：<span word="PB">PB</span>长小于45的几率是多少?答：3/8</p><p> 263. <span word="DS">DS</span>: <span word="O">O</span> <span word="could">could</span> <span word="be">be</span> <span word="addition">addition</span>, <span word="subtraction">subtraction</span>, <span word="or">or</span> <span word="multiplication">multiplication</span>. <span word="what">what</span> <span word="is">is</span> <span word="O">O</span>?</p><p> 6 <span word="O">O</span> 2 = 2 <span word="O">O</span> 6</p><p> 7 <span word="O">O</span> <span word="not">not</span> <span word="equal">equal</span> <span word="to">to</span> 7 <span word="O">O</span> 3 + 7 <span word="O">O</span> 5</p><p> <span word="Choose">Choose</span></p><p> <span word="Are">Are</span> <span word="a">a</span>,<span word="b">b</span>,<span word="c">c</span>,<span word="d">d</span> <span word="consecutive">consecutive</span> <span word="intergers">intergers</span>? <span word="c">c</span>-<span word="b">b</span>=1 <span word="d">d</span>-<span word="a">a</span>=3 <span word="Choose">Choose</span> 265. <span word="DS">DS</span>: <span word="The">The</span> <span word="ratio">ratio</span> <span word="of">of</span> <span word="the">the</span> <span word="income">income</span> <span word="of">of</span> <span word="Karl">Karl</span> <span word="to">to</span> <span word="that">that</span> <span word="of">of</span> <span word="Mia">Mia</span> <span word="is">is</span> 10:9 <span word="in">in</span> 1994, <span word="Did">Did</span> <span word="Mia">Mia</span> <span word="earn">earn</span> <span word="more">more</span> <span word="in">in</span> 1995 <span word="than">than</span> <span word="in">in</span> 1994? <span word="Karl">Karl</span> <span word="earned">earned</span> <span word="more">more</span> <span word="in">in</span> 1994 <span word="than">than</span> <span word="in">in</span> 1995? <span word="the">the</span> <span word="ratio">ratio</span> <span word="of">of</span> <span word="the">the</span> <span word="income">income</span> <span word="of">of</span> <span word="Karl">Karl</span> <span word="to">to</span> <span word="that">that</span> <span word="of">of</span> <span word="Mia">Mia</span> <span word="is">is</span> 9:10 <span word="in">in</span> 1995 <span word="Choose">Choose</span> 266. <span word="PS">PS</span>: <span word="X">X</span>,<span word="Y">Y</span> <span word="are">are</span> <span word="digits">digits</span>, <span word="if">if</span> 0.<span word="XY">XY</span>+0.<span word="YX">YX</span>=0.<span word="XX">XX</span>, <span word="whats">whats</span> <span word="Y">Y</span>? <span word="Choose">Choose</span> <span word="Y">Y</span>=0 267. <span word="PS">PS</span>: <span word="a">a</span> <span word="sequence">sequence</span> <span word="a">a</span>_<span word="i">i</span> = <span word="a">a</span>_{<span word="i">i</span>-1}+<span word="d">d</span> 等差数列 <span word="If">If</span> <span word="the">the</span> <span word="first">first</span> <span word="term">term</span> <span word="is">is</span> 54, 17<span word="th">th</span> <span word="term">term</span> <span word="is">is</span> 30, <span word="what">what</span> <span word="is">is</span> 25<span word="th">th</span> <span word="term">term</span>? <span word="Choose">Choose</span> 18 268.10个连续的整数,它们的和是多少?1) 其中的负数比正数多3个 2)<span word="range">range</span>是--3 269. 10的负3次方是多少? 270. 10个人中选出6个采访有多少种<span word="combination">combination</span>? 271. <span word="a">a</span>公司1997年和1998年分别比上年增长20%, <span word="b">b</span>公司1997年比上年增长40% 1998年比上年增长1%, 假如<span word="a">a</span>公司一共增长<span word="x">x</span>, <span word="b">b</span>公司一共增长<span word="y">y</span>,那么 <span word="xy">xy</span>, <span word="x">x</span> 02,还有一个选项不记得了. 272. <span word="a">a</span>在一个小时内完成<span word="x">x</span>吨的任务, <span word="b">b</span>在一个小时内完成<span word="y">y</span>吨的任务, 假如<span word="a">a</span>和<span word="b">b</span> 一起完成10吨的任务,那么需要多余12小时的时间吗? 1) <span word="yx">yx</span> 2)<span word="y">y</span>0.4 273.135<span word="ps">ps</span>:一个半圆的<span word="street">street</span>,直径为1<span word="mile">mile</span>,7个点把这个半圆分成相等的8段,某人以15<span word="mile">mile</span>/<span word="hour">hour</span>从最左一点开始走,问3分钟后他在哪2点之间? 作者答案及思路：我选第四段 274.137<span word="ps">ps</span>:有一题说民主党和共和党比例为3：5，加了600个民主党和500个共和党，比例变为4：5，问加入后新的共和党比民主党多多少人。作者答案及思路： <span word="dz">dz</span>评价意见：可以求出原有民主党600人，共和党1000人，增加后分别为1200和1500，相差300人。 275. 直线<span word="y">y</span>=<span word="ax">ax</span>+<span word="b">b</span>的斜率是否大于2? 1) <span word="a">a</span>=1 2)<span word="b">b</span>=3 276. <span word="ps">ps</span>:长方形面积36，长比宽多5，问宽多少? 277. 261<span word="ds">ds</span>:问(<span word="x">x</span>-3)^2的个位数是几 <span word="a">a</span>，(<span word="x">x</span>+1)^2的个位是1， <span word="b">b</span>，(<span word="x">x</span>+3)^2的个位是2. 278. 269<span word="ds">ds</span>:两个人的每小时工资不一样，打上周两人的收入一样，问<span word="m">m</span>的每小时工资大于20吗? <span word="a">a</span>， <span word="n">n</span>的工资/小时为25元 <span word="b">b</span>，<span word="n">n</span>上周的工作时间多于<span word="m">m</span>。 279.270<span word="ds">ds</span>:某人的工资由提成和基本工资构成，提成是大于10000美圆部分的20%，问基本工资是多少? <span word="a">a</span>，上个月的提成是基本工资的5倍，<span word="b">b</span>上个月的销售是60000 280.271<span word="ps">ps</span>:老<span word="jj">jj</span>， 1/2+1/2^2+1/2^10 的范围。 281.275<span word="ps">ps</span>:一个书店的新书卖￥13，旧书卖￥5，新书的利润是成本的30%，旧书的利润是成本的100%，如果一个人在该书店买了￥67的书，书店得多少利润。</p>
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