gre数学：5道难题解答1
<p> 新版<span word="gre">gre</span>考试数学正在越来越难，这是由于美国数学基础教育的难度增加导致的，而改革后的新<span word="gre">gre</span>考试，更加注重考察考生的研究能力，同时在内容和形式上都有很大变化，出现了无选项计算题，这意味对考生解题思路要求提高了，所以不能对新<span word="gre">gre</span>考试数学掉以轻心。下面随小编为大家搜索整理的<span word="gre">gre</span>数学难题，考试之前预热一下吧：</p><p> 1.<span word="Sixty">Sixty</span>-<span word="eight">eight</span> <span word="people">people</span> <span word="are">are</span> <span word="sitting">sitting</span> <span word="in">in</span> 20 <span word="cars">cars</span> <span word="and">and</span> <span word="each">each</span> <span word="car">car</span> <span word="contains">contains</span> <span word="at">at</span> <span word="most">most</span> 4 <span word="people">people</span>. <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="maximum">maximum</span> <span word="possible">possible</span> <span word="number">number</span> <span word="of">of</span> <span word="cars">cars</span> <span word="that">that</span> <span word="could">could</span> <span word="contain">contain</span> <span word="exactly">exactly</span> 1 <span word="of">of</span> <span word="the">the</span> 68 <span word="people">people</span>.</p><p> <span word="A">A</span>. 2</p><p> <span word="B">B</span>. 3</p><p> <span word="C">C</span>. 4</p><p> <span word="D">D</span>. 8</p><p> <span word="E">E</span>. 12</p><p> 翻译：68个人分别坐在20辆车中，每辆车最多可坐4个人，那么最多有多少辆车可以只坐一个人。</p><p> 解答：要让坐1个人的车尽量多，那么别的车应该坐尽量多的人除去坐一个人的车，其余车都坐4个人 <span word="X">X</span>为坐1人的车，<span word="Y">Y</span>为坐4人的车 <span word="X">X</span>+<span word="Y">Y</span>=20 <span word="X">X</span>+4<span word="Y">Y</span>=68<span word="X">X</span>=4 选<span word="C">C</span></p><p> 考点：取极端的思路，主要是要想到怎样才能让坐一个人的车尽量多。</p><p> 2. <span word="If">If</span> <span word="n">n</span> <span word="is">is</span> <span word="any">any</span> <span word="prime">prime</span> <span word="number">number</span> <span word="greater">greater</span> <span word="than">than</span> 2, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="CANNOT">CANNOT</span> <span word="be">be</span> <span word="a">a</span> <span word="prime">prime</span> <span word="number">number</span></p><p> <span word="A">A</span>. <span word="n">n</span>-4</p><p> <span word="B">B</span>. <span word="n">n</span>-3</p><p> <span word="C">C</span>. <span word="n">n</span>-1</p>
页:
[1]