解析GRE数学中的易错点
<p> 新<span word="GRE">GRE</span>数学考试有哪些容易出错的地方呢?考生在备考<span word="GRE">GRE</span>数学的时候，往往有一些部分容易出现错误，下面小编就给大家解析一下新<span word="GRE">GRE</span>数学考试的易错部分，供大家参考。</p><p> 新<span word="GRE">GRE</span>数学考试易错部分难点解析如下：</p><p> 在概率问题中只有独立事件才可以用<span word="P">P</span>=<span word="PP">PP</span>，比如下面：</p><p> 1、<span word="The">The</span> <span word="probability">probability</span> <span word="of">of</span> <span word="the">the</span> <span word="occurrence">occurrence</span> <span word="of">of</span> <span word="matter">matter</span> <span word="A">A</span> <span word="is">is</span> 0.6 <span word="while">while</span> <span word="that">that</span> <span word="of">of</span> <span word="matter">matter</span> <span word="B">B</span> <span word="is">is</span> 0.7, <span word="what">what</span> <span word="s">s</span> <span word="the">the</span> <span word="probability">probability</span> <span word="of">of</span> <span word="the">the</span> <span word="coincidence">coincidence</span> <span word="of">of</span> <span word="A">A</span> <span word="and">and</span> <span word="B">B</span></p><p> 解析：<span word="A">A</span>和<span word="B">B</span>是否为独立事件，不知道，所以无法判断。</p><p> 2、如果上题问<span word="A">A</span>和<span word="B">B</span>都不发生的概率呢?</p><p> 解析：<span word="A">A</span>不发生的概率是0.4,<span word="B">B</span>是0.3，所以他们的交集是0.3，所以答案应该是0.3。</p><p> 3、如果我告诉你上面的<span word="A">A</span>和<span word="B">B</span>成功发生的概率都是他们各自独立的，那么还是问<span word="AB">AB</span>一起成功的概率?</p><p> 解析：答案还是不确定。因为<span word="A">A</span>和<span word="B">B</span>虽然独立，但是他们加起来是否相互影响，是促进还是遏制，不清楚，所以答案不是大家理想的0.42。</p><p> 4、小于100的整数中有多少可被6整除?</p><p> 解析：无穷多个，别忘了整数包括负数。</p><p> <span word="EX">EX</span>9：有300个人，<span word="A">A</span>，<span word="B">B</span>，<span word="C">C</span>是三个俱乐部，分别有180，170，160个人，已知<span word="A">A</span>交<span word="B">B</span>有90，<span word="B">B</span>交<span word="C">C</span>有80，<span word="A">A</span>交<span word="C">C</span>有85，那么问<span word="A">A</span>，<span word="B">B</span>，<span word="C">C</span>都交的人数。</p>
页:
[1]