g友分享gre数学机经讨论题(4)
<p> 下面是参加了海外<span word="gre">gre</span>数学机经的同学分享的<span word="gre">gre</span>数学机经，希望通过自己的分析和解答能给其他<span word="gre">gre</span>考生提供思路和指导，也可以和周边的<span word="g">g</span>友一起来讨论这些题目，对于<span word="gre">gre</span>数学考试的复习是相当有帮助的。</p><p> 16、过去一年，一个股票的价格<span word="range">range</span>为<span word="r">r</span>，6周前这个股票价格为<span word="p">p</span>，上周这个股票的价格可能为? 选<span word="p">p</span>-<span word="r">r</span>/2，其他的不是大于<span word="p">p</span>+<span word="r">r</span>就是小于<span word="p">p</span>-<span word="r">r</span></p><p> <span word="range">range</span> = <span word="max">max</span>-<span word="min">min</span> = <span word="r">r</span></p><p> 得知该股票价格的范围是: <span word="p">p</span>-<span word="r">r</span> ~ <span word="p">p</span>+<span word="r">r</span> 在此范围中选答案即可</p><p> 17、有一个公司有250个<span word="code">code</span> <span word="area">area</span>分别位于<span word="Northeast">Northeast</span>, <span word="Mxxx">Mxxx</span>地,<span word="Fxxx">Fxxx</span>地,<span word="California">California</span>这四个地方,在<span word="Northeast">Northeast</span>的<span word="codearea">codearea</span>的数量是在<span word="M">M</span>地的二倍,是在<span word="F">F</span>地的四倍,是在<span word="California">California</span>的4/3倍.公司一共有150,000单位的产品, 每个地方分配的是25%的产品总数,问在<span word="California">California</span>平均每个<span word="code">code</span> <span word="area">area</span>分配到了多少产品. <span word="A">A</span>.500-----答案</p><p> 地点: <span word="N">N</span> <span word="M">M</span> <span word="F">F</span> <span word="C">C</span></p><p> 对应的工厂数: 2<span word="a">a</span> <span word="a">a</span> 0.5<span word="a">a</span> 1.5<span word="a">a</span> 2<span word="a">a</span> + <span word="a">a</span> + 0.5<span word="a">a</span> + 1.5<span word="a">a</span>=250 所以 <span word="a">a</span>=50 所以<span word="California">California</span>有1.550=75间工厂 所以<span word="California">California</span>的工厂拥有的平均产品数:/ 75=500</p><p> 18、装电话，给出一个表格，列出两种方案<span word="A">A</span>和<span word="B">B</span>，<span word="A">A</span>有初装费，但之后的月租低，<span word="B">B</span>没初装，但月租高。问使用几个月的话<span word="A">A</span>和<span word="B">B</span>的费用相等。</p><p> 题目不全，根据题意，设<span word="x">x</span>个月后费用相等，按表格中的数据列等式即可求得</p>
页:
[1]