GRE数学考生回忆（6）
<p> <span word="GRE">GRE</span>机经是很有效的<span word="GRE">GRE</span>备考资料，下面为大家讨论了一些新<span word="GRE">GRE</span>数学机经，一起来看一下吧。</p><p> 26 、数学有一道79^2 等于什么。</p><p> 27、数学就记得一个<span word="ps">ps</span>，给了个概念是<span word="digital">digital</span> <span word="root">root</span> ，给了个例子 87654321= 8+7+6+5+4+3+2+1=36， 然后36= 3+6=9 ,所以他的<span word="digital">digital</span> <span word="root">root</span>就是9 ，然后给了个 2^<span word="X">X</span>5^<span word="Y">Y</span>7^<span word="Z">Z</span>，问他的<span word="digital">digital</span> <span word="root">root</span>是多少，原理就是2和5结合起来，得到10的几次方，然后把剩下那些杂数字相乘起来，再用那个概念，最后求解。</p><p> 题目不全</p><p> 28 、有一个<span word="DS">DS</span>，是<span word="P">P</span>,<span word="Q">Q</span>,<span word="R">R</span>,<span word="S">S</span>四个数，貌似是正实数，问 <span word="is">is</span> <span word="P">P</span>%<span word="of">of</span> <span word="Q">Q</span> <span word="less">less</span> <span word="than">than</span> <span word="R">R</span>% <span word="of">of</span> <span word="S">S</span>?</p><p> 条件一是0</p><p> 条件一是0</p><p> 实际上就是比较<span word="pq">pq</span>与<span word="rs">rs</span>的大小</p><p> 条件1)可以举例 02232 那么<span word="pqrs">pqrs</span>，若是02232 则<span word="pq">pq</span></p><p> 条件2) 也可举例 不确定</p><p> 条件1)+2)：两式相乘，<span word="r">r</span>30, <span word="r">r</span>0 ，同理，<span word="so">so</span> 能够确定是<span word="pq">pq</span></p><p> 选<span word="C">C</span></p><p> 29、今年的<span word="gross">gross</span> <span word="profit">profit</span> 通过涨价增加了，增加的数是25% <span word="of">of</span> <span word="cost">cost</span>。 然后说今年的<span word="price">price</span> 是80，去年的<span word="price">price</span>是76.8，然后<span word="cost">cost</span>都保持不变，最后问你在涨价之前<span word="gross">gross</span> <span word="profit">profit</span>, <span word="as">as</span> <span word="percent">percent</span> <span word="of">of</span> <span word="cost">cost</span>，是多少?答案是20%</p><p> = 0.25 <span word="cost">cost</span> 可知：<span word="cost">cost</span> = 12.8 涨价之前<span word="gross">gross</span> <span word="profit">profit</span> = 76.812.8 = 64 所以占<span word="cost">cost</span>： 64 / 12.8 =500% 注意：此题根据回忆答案是20%，猜测是：12.8 / 64 =20% 那么应该是问<span word="cost">cost</span>占<span word="gross">gross</span> <span word="profit">profit</span>多少，考场上请注意具体问法</p>
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