GMAT数学辅导:GR数学题网友总结2
<p> 为了方便广大考生更好的复习，综合整理了<span word="GMAT">GMAT</span>数学辅导:<span word="GR">GR</span>数学题网友总结，以供各位考生考试复习参考,希望对考生复习有所帮助。愿大家都能取得好成绩，更多有关留学考试的资讯与辅导资料敬请关注留学考试。</p><p> 【注】 1、【确认】表示经讨论为确认答案。</p><p> 2、【讨论】表示答案尚未最终确认，请大家提供思路或将题目补充完整。</p><p> 3、括号内数字表示出现次数。</p><p> 4. 问<span word="A">A</span>是否大于零，<span word="A">A</span>.<span word="X">X</span>^3 <span word="B">B</span>. <span word="X">X</span>^3+<span word="x">x</span>+1=0</p><p> 和老<span word="JJ">JJ</span>不同，老机经是<span word="X">X</span>^2+<span word="X">X</span>+1=0</p><p> 讨论：应该是问<span word="X">X</span>是否大于零吧，<span word="X">X</span>^3+<span word="x">x</span>+1=0 应该也是无解。如果是无解的情况应该选<span word="A">A</span> <span word="or">or</span> <span word="D">D</span> 哪一个，本题我倾向于选择 <span word="D">D</span></p><p> 附老机经：</p><p> 13. <span word="Is">Is</span> <span word="X">X</span>0?</p><p> <span word="a">a</span>.) <span word="X">X</span>^30</p><p> <span word="b">b</span>.) <span word="X">X</span>^2+<span word="X">X</span>+1 =0</p><p> <span word="D">D</span>,</p><p> <span word="a">a</span>) <span word="is">is</span> <span word="obvious">obvious</span> <span word="sufficient">sufficient</span>.</p><p> <span word="for">for</span> <span word="b">b</span>), <span word="because">because</span> <span word="x">x</span>1<span word="x">x</span>2=1, <span word="x">x</span>1+<span word="x">x</span>2=-1, <span word="then">then</span> <span word="x">x</span> <span word="are">are</span> <span word="sure">sure</span> <span word="to">to</span> 0,</p><p> <span word="SO">SO</span> <span word="D">D</span>!</p><p> <span word="B">B</span>不充分: 因为<span word="X">X</span>^2+<span word="X">X</span>+1 =0 无解呀. 应该选<span word="A">A</span>吧</p><p> 【讨论】<span word="D">D</span> 。<span word="X">X</span>^2+<span word="X">X</span>+1 =0 无实数解，<span word="SO">SO</span> <span word="X">X</span>0不成立</p><p> 5. 一个三角形，一个角60度，另一个45度，45度角对应的边长10，问60度对应的边长。5根号6</p><p> 【确认】 5根号6</p>
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