真题汇总:12月15日gre数学真题部分
<p> <span word="Wednesday">Wednesday</span>, <span word="December">December</span> 15, 2009</p><p> 1. <span word="Let">Let</span> <span word="S">S</span> <span word="indicates">indicates</span> <span word="sum">sum</span> <span word="of">of</span> <span word="all">all</span> <span word="even">even</span> <span word="nos">nos</span> <span word="from">from</span> 1 <span word="to">to</span> 100 <span word="and">and</span> <span word="N">N</span> <span word="indicates">indicates</span> <span word="sum">sum</span> <span word="of">of</span> <span word="all">all</span> <span word="odd">odd</span> <span word="nos">nos</span> <span word="from">from</span> 1 <span word="to">to</span> 100, <span word="then">then</span> <span word="S">S</span>-<span word="N">N</span> <span word="equals">equals</span> <span word="to">to</span></p><p> <span word="A">A</span>. 0</p><p> <span word="B">B</span>. 99</p><p> <span word="C">C</span>. 100</p><p> <span word="D">D</span>. 199</p><p> <span word="E">E</span>. 200 </p><p> 2. <span word="If">If</span> <span word="x">x</span>1, <span word="then">then</span></p><p> <span word="Col">Col</span> <span word="A">A</span>: <span word="power">power</span> <span word="x">x</span></p><p> <span word="Col">Col</span> <span word="B">B</span>: <span word="x">x</span> <span word="power">power</span></p><p> 3. <span word="Col">Col</span> <span word="A">A</span>: 2 <span word="power">power</span> <span word="x">x</span></p><p> <span word="Col">Col</span> <span word="B">B</span>: 2 <span word="power">power</span> 3<span word="x">x</span></p><p> 4. <span word="Given">Given</span> <span word="sets">sets</span> <span word="f">f</span>0, <span word="f">f</span>1, <span word="f">f</span>2, <span word="f">f</span>3, .................. <span word="f">f</span>9 <span word="which">which</span> <span word="has">has</span> <span word="numbers">numbers</span> <span word="according">according</span> <span word="to">to</span> <span word="their">their</span> <span word="unit">unit</span> <span word="digits">digits</span> <span word="for">for</span> <span word="example">example</span> <span word="f">f</span>5 <span word="has">has</span> <span word="numbers">numbers</span> 5, 15, 25, ....... <span word="etc">etc</span>. <span word="Then">Then</span>, <span word="the">the</span> <span word="cubes">cubes</span> <span word="of">of</span> <span word="the">the</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="set">set</span> <span word="f">f</span>7 <span word="are">are</span> <span word="present">present</span> <span word="in">in</span> <span word="which">which</span> <span word="set">set</span>?</p><p> <span word="A">A</span>. <span word="f">f</span>2</p><p> <span word="B">B</span>. <span word="f">f</span>3</p><p> <span word="C">C</span>. <span word="f">f</span>5</p><p> <span word="D">D</span>. <span word="f">f</span>7</p><p> <span word="E">E</span>. <span word="f">f</span>9 </p><p> 5. <span word="Given">Given</span> <span word="f">f</span> = 4 + 20<span word="x">x</span> + 25; <span word="x">x</span> <span word="as">as</span> <span word="an">an</span> <span word="integer">integer</span>.</p><p> <span word="Col">Col</span> <span word="A">A</span>: <span word="Minimum">Minimum</span> <span word="value">value</span> <span word="of">of</span> <span word="f">f</span></p><p> <span word="Col">Col</span> <span word="B">B</span>: 0</p><p> 6. <span word="If">If</span> <span word="a">a</span> <span word="ball">ball</span> <span word="is">is</span> <span word="dropped">dropped</span> <span word="from">from</span> <span word="a">a</span> <span word="height">height</span> <span word="of">of</span> 6 <span word="miles">miles</span>, <span word="the">the</span> <span word="ball">ball</span> <span word="will">will</span> <span word="bounce">bounce</span> <span word="back">back</span> <span word="with">with</span> 90% <span word="of">of</span> <span word="its">its</span> <span word="previous">previous</span> <span word="height">height</span>. <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="height">height</span> <span word="of">of</span> <span word="the">the</span> <span word="ball">ball</span> <span word="after">after</span> 5<span word="th">th</span> <span word="bounce">bounce</span>?</p><p> <span word="A">A</span>. <span word="power">power</span> 5</p><p> <span word="B">B</span>. <span word="power">power</span> 6</p><p> <span word="C">C</span>. 6 <span word="power">power</span> 4</p><p> <span word="D">D</span>. 6 <span word="power">power</span>5</p><p> <span word="E">E</span>. 6 <span word="power">power</span> 4</p><p> 7. <span word="Given">Given</span> <span word="mod">mod</span><span word="x">x</span> <span word="is">is</span> <span word="an">an</span> <span word="integer">integer</span>. <span word="Find">Find</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="possible">possible</span> <span word="values">values</span> <span word="of">of</span> <span word="x">x</span>?</p><p> <span word="A">A</span>. 1</p>
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