GMAT考试数学辅导04年1月数学总结(一)
<p> 1.<span word="DS">DS</span>：<span word="if">if</span> <span word="m">m</span>/<span word="n">n</span>=7/15, <span word="mn">mn</span>=?</p><p> <span word="A">A</span>)<span word="m">m</span>，<span word="n">n</span>都为正整数 <span word="B">B</span>)<span word="m">m</span>,<span word="n">n</span> 的最大公约数为3</p><p> 2.<span word="ds">ds</span>: <span word="Y">Y</span>0?</p><p> 1)<span word="XY">XY</span>0</p><p> 2)<span word="XY">XY</span>^20</p><p> <span word="MY">MY</span> <span word="CHOICE">CHOICE</span>: <span word="C">C</span></p><p> 3.集合<span word="S">S</span>为8个连续整数集合，集合<span word="T">T</span>是<span word="S">S</span>中每个整数加4以后，以及<span word="S">S</span>中的每个整数减4以后的整数集合。问<span word="T">T</span>比<span word="S">S</span>多多少个整数?</p><p> 1)4 2)8 3)2</p><p> <span word="MY">MY</span> <span word="CHOICE">CHOICE</span>: 2) 8</p><p> <span word="ps">ps</span>：这道题可以变化一下，比如问<span word="T">T</span>与<span word="S">S</span>的交集有多少个整数，大家可以做做。</p><p> 4. 3男3女中选4个人，问4个人中男女相等的概率?</p><p> <span word="MY">MY</span> <span word="CHOICE">CHOICE</span>: 3/5</p><p> 5. 1/</p><p> <span word="MY">MY</span> <span word="CHOICE">CHOICE</span>: 9+4根号5</p><p> 6. <span word="A">A</span>1=2, <span word="A">A</span>2=5, <span word="An">An</span>=<span word="A">A</span>-<span word="A">A</span>, <span word="n">n</span>=1,问该数列的前100项的和?</p><p> 7.条件：</p><p> 1) <span word="X">X</span>和<span word="Y">Y</span>两个机器可以用来生产产品，同样生产<span word="W">W</span>的产品，<span word="X">X</span>要比<span word="Y">Y</span>多花2小时</p><p> 2) <span word="X">X</span>和<span word="Y">Y</span>两个机器一起生产3小时的话，可以生产出三分之四<span word="W">W</span>的产品</p><p> 问题：</p><p> 如果要<span word="X">X</span>单独生产2<span word="W">W</span>产品的话，需要花费多长时间?</p><p> 8.<span word="tax">tax</span> <span word="fare">fare</span>, <span word="the">the</span> <span word="first">first</span> 1/7<span word="mile">mile</span> <span word="charges">charges</span> 1.52<span word="dollars">dollars</span>, <span word="then">then</span> 0.33<span word="dollars">dollars</span> <span word="for">for</span> <span word="each">each</span> <span word="additionally">additionally</span> 1/7<span word="miles">miles</span> <span word="or">or</span> <span word="partly">partly</span> .<span word="ask">ask</span> <span word="the">the</span> <span word="fares">fares</span> <span word="of">of</span> <span word="a">a</span> 4.6-<span word="mile">mile</span> <span word="trip">trip</span>.</p><p> 9.一个调查，人数是60，对三种冰淇淋----<span word="v">v</span>,<span word="s">s</span>,<span word="c">c</span>的偏好，其中3/5的人将<span word="v">v</span>排在最后，2/15的人将<span word="v">v</span>排在<span word="c">c</span>前面， 3/10的人将<span word="v">v</span>排在<span word="s">s</span>前面， 问将<span word="v">v</span>排在最前面的人数。</p>
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