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Old 05-19-2011, 01:41 PM   #1
chufan9401
 
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Default 网上一道数学题引热议 据称340万网友做过此题

  网络“神题”:6÷2(1+2)=?

  340万网民解题得出两种答案数学老师:单项式作怪正解为9

  “6÷2(1+2)=?”近日,网上一道看似简单的数学题,答案却引起无数网友的激烈讨论 。

  记者在网上看到,这道题被称为“神题”,据称全球已经有超过340万网友做过此题,但却出现有争议的两 个答案,分别为1和9。

  两派交锋

  认为答案为1

  这部分网友认为,针对“2(1+2)”这个式子,应该从系数角度看成一个整体。以3x为例说明,从系数 角度看,3x并不是3・x,也不是3×x,而是代表一个整体数值。

  其次,直接跟在括号外的数字,是作为括号以内内容的系数存在,而不是作为乘法计算存在的。这就意味着括 号内的(1+2)每一项都要乘以2。

  “所以2(1+2)绝对不等于2×(1+2),而等于(1×2+2×2),再回到标题中的题目,6÷2 (1+2)=?谁还打算选9?”有网友表示。

  VS

  认为答案为9

  但也有网友认为,根据加减乘除四则的混合运算法则,应该先算括号里面的,得出结果为3,剩下的就是乘除 法运算。再根据运算法则规定,即同级运算,从左往右计算。

  “小学生都会的运算法则,同级运算从左往右啊。”有网友表示,6÷2(1+2)也就是6÷2×3,答案 自然是9。

  数学老师解析

  2(1+2)不是单项式此题答案应为9

  这道网络“神题”到底等于几?今天上午,北京工商大学理学院数学系的刘老师表示,按照运算法则,应该先 计算括号里的式子,即式子变成,“6除以2然后乘以3”的同级运算,按照同级别运算,nike shox,从左往右算结果为9。

  刘老师分析,有人把“2(1+2)”看做一个整体,是因为中学的数学课本里提到过,cool nike air max,数字与字母相乘,可以省略乘号,并且数字和字母的组合可以看做是一个单项式。但是这道题目里没有字母,就 不应有单项式一说。

  再有,2×和2()并不是一个概念,2()不是一个系数,不代表这是一个整体,只是习惯意义上乘法的一 种省略写法,所以不能用括号里的每一项乘以括号外面的数。

  按照运算法则计算,即先算括号内的,而同级运算,要从左往右,结果是9,nike shoes uk

  此外,Nike Air Max Tailwind,这道题由于式子后半部分比较紧凑,从视觉感官上就容易先算后面,也有一定的心理作用。

  “这种运算一般就在小学出现,老师教的时候不能引导学生这么写,写式子时应该要注意规范,该写乘号就写 乘号,以避免歧义。”刘老师强调。

  文/记者 王妍
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Old 05-19-2011, 01:43 PM   #2
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