发人深省的小故事：问题是什么
<p><span word="There">There</span> <span word="once">once</span> <span word="was">was</span> <span word="a">a</span> <span word="famous">famous</span> <span word="professor">professor</span>, <span word="who">who</span> <span word="always">always</span> <span word="wrote">wrote</span> <span word="the">the</span> <span word="number">number</span> 2 <span word="and">and</span> 4 <span word="on">on</span> <span word="the">the</span> <span word="blackboard">blackboard</span> <span word="at">at</span> <span word="the">the</span> <span word="first">first</span> <span word="course">course</span> <span word="to">to</span> <span word="his">his</span> <span word="new">new</span> <span word="students">students</span>, <span word="and">and</span> <span word="asked">asked</span> <span word="the">the</span> <span word="students">students</span> <span word="what">what</span> <span word="is">is</span> <span word="the">the</span> <span word="answer">answer</span>.</p><p>一位非常著名的教授，每次给新生上第一堂课时，总是在黑板上写下2和4两个数字，然后转过身问学生：答案是什么?</p><p><span word="Every">Every</span> <span word="time">time</span> <span word="when">when</span> <span word="he">he</span> <span word="asked">asked</span> <span word="this">this</span> <span word="question">question</span>, <span word="some">some</span> <span word="of">of</span> <span word="his">his</span> <span word="students">students</span> <span word="said">said</span> 6 <span word="is">is</span> <span word="the">the</span> <span word="key">key</span> <span word="while">while</span> <span word="some">some</span> <span word="others">others</span> <span word="hold">hold</span> <span word="that">that</span> 2 <span word="is">is</span> <span word="more">more</span> <span word="proper">proper</span> <span word="and">and</span> <span word="some">some</span> <span word="of">of</span> <span word="them">them</span> <span word="chose">chose</span> 8 <span word="as">as</span> <span word="the">the</span> <span word="answer">answer</span>, <span word="moreover">moreover</span>, <span word="there">there</span> <span word="were">were</span> <span word="still">still</span> <span word="others">others</span> <span word="who">who</span> <span word="were">were</span> <span word="just">just</span> <span word="sitting">sitting</span> <span word="at">at</span> <span word="their">their</span> <span word="seats">seats</span> <span word="without">without</span> <span word="a">a</span> <span word="word">word</span>.</p><p>有的同学说是6，有的同学说是2，还有的说是8。其他的一些人感觉无聊，坐在那里一言不发。</p><p><span word="But">But</span> <span word="at">at</span> <span word="the">the</span> <span word="time">time</span> <span word="that">that</span> <span word="the">the</span> <span word="students">students</span> <span word="were">were</span> <span word="discussing">discussing</span> <span word="the">the</span> <span word="issues">issues</span>, <span word="the">the</span> <span word="professor">professor</span> <span word="always">always</span> <span word="sighed">sighed</span> <span word="and">and</span> <span word="said">said</span> <span word="to">to</span> <span word="the">the</span> <span word="students">students</span> <span word="It">It</span> <span word="is">is</span> <span word="no">no</span> <span word="use">use</span> <span word="for">for</span> <span word="you">you</span> <span word="to">to</span> <span word="debate">debate</span> <span word="because">because</span> <span word="all">all</span> <span word="of">of</span> <span word="you">you</span> <span word="did">did</span> <span word="not">not</span> <span word="focused">focused</span> <span word="the">the</span> <span word="key">key</span> <span word="point">point</span>: <span word="what">what</span> <span word="exactly">exactly</span> <span word="the">the</span> <span word="question">question</span> <span word="is">is</span> <span word="asked">asked</span> <span word="about">about</span>? <span word="Do">Do</span> <span word="those">those</span> <span word="two">two</span> <span word="numbers">numbers</span> <span word="were">were</span> <span word="being">being</span> <span word="to">to</span> <span word="be">be</span> <span word="added">added</span>, <span word="subtracted">subtracted</span> <span word="or">or</span> <span word="be">be</span> <span word="acquired">acquired</span> <span word="to">to</span> <span word="do">do</span> <span word="some">some</span> <span word="other">other</span> <span word="calculations">calculations</span>? <span word="Without">Without</span> <span word="what">what</span> <span word="the">the</span> <span word="question">question</span> <span word="is">is</span> <span word="exactly">exactly</span> <span word="about">about</span>, <span word="how">how</span> <span word="can">can</span> <span word="you">you</span> <span word="make">make</span> <span word="a">a</span> <span word="right">right</span> <span word="respond">respond</span>.</p><p>就在大家议论纷纷的时候，教授叹着气对学生们说：你们争论是没有用的，因为你们都没有注意到一个关键的问题：这个问题到底在问什么?是加是减，是乘是除?还是其他什么?不知道问题的所在，怎样能得出正确的答案?</p>
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