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=1 7 30.43%
=9 16 69.57%
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旧 Jun 19th, 2011, 00:04     #1
hi13579
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默认 9÷3(1+2)

9÷3(1+2) = 1 or 9 ? ?好像都有道理。

此帖于 Jun 19th, 2011 09:39 被 hi13579 编辑。
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旧 Jun 19th, 2011, 11:11   只看该作者   #2
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默认

是9÷3x(1+2)
还是9/3(1+2)?

健康元素 www.nelements.ca
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旧 Jun 19th, 2011, 11:16   只看该作者   #3
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默认

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作者: nelements 查看帖子
是9÷3x(1+2)
还是9/3(1+2)?
不都一样吗?
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旧 Jun 19th, 2011, 11:32   只看该作者   #4
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默认

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作者: hi13579 查看帖子
9÷3(1+2) = 1 or 9 ? ?好像都有道理。怎么可能都有道理呢

9 ÷ 3 X ( 1 + 2 ) 就这个还有什么可疑问的! 不就是等于 9 嘛 !

来教教你们这些受过高等教育的人一些小学简单算数。 算数的规则:先括号内再括号外、先乘除后加减、先前边再后边。
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旧 Jun 19th, 2011, 12:42   只看该作者   #5
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默认

有括号的优先级最高,没有括号的先乘除后加减
9÷3(1+2)=9
9÷(3(1+2))=1
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旧 Jun 19th, 2011, 21:10   只看该作者   #6
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默认

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作者: pumady 查看帖子
有括号的优先级最高,没有括号的先乘除后加减
9÷3(1+2)=9
9÷(3(1+2))=1
Like 9÷3(x+y)=9/3(x+y)
if x=1, y=2
then
9÷3(x+y)=9/3(1+2)=1 ??

不知道,晕。
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旧 Jun 20th, 2011, 12:22   只看该作者   #7
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默认

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作者: hi13579 查看帖子
Like 9÷3(x+y)=9/3(x+y)
if x=1, y=2
then
9÷3(x+y)=9/3(1+2)=1 ??

不知道,晕。


http://www.google.com/#sclient=psy&h...w=1225&bih=819
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旧 Jun 20th, 2011, 13:09   只看该作者   #8
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默认

引用:
作者: hi13579 查看帖子
Like 9÷3(x+y)=9/3(x+y)
if x=1, y=2
then
9÷3(x+y)=9/3(1+2)=1 ??

不知道,晕。
9÷3(x+y)=9÷3x(x+y), 在没有括号的情况下,乘和除是同级的,没有优先,要从左向右按顺序算,所以要先算9÷3=3,然后再算3x(x+y)。很多人一看到3(1+2)就认为应该先算,其实它们并没有被括起来,所以算完括号内的,剩下的要从左至右按顺序算。
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旧 Jun 20th, 2011, 13:29   只看该作者   #9
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默认

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作者: pumady 查看帖子
9÷3(x+y)=9÷3x(x+y), 在没有括号的情况下,乘和除是同级的,没有优先,要从左向右按顺序算,所以要先算9÷3=3,然后再算3x(x+y)。很多人一看到3(1+2)就认为应该先算,其实它们并没有被括起来,所以算完括号内的,剩下的要从左至右按顺序算。
Like 9÷3y
if y=(2+1)
then
9÷3y=9÷9=1
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旧 Jun 20th, 2011, 14:22   只看该作者   #10
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默认

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Like 9÷3y
if y=(2+1)
then
9÷3y=9÷9=1


if 9÷3(y) = 9
y is not 3;


if 9÷3(y) = 1
y is 3;

so
9÷3(2+1) will be 1
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旧 Jun 20th, 2011, 16:08   只看该作者   #11
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默认

小学数学亚

癞蛤蟆有心事:为什么我长得这么丑?!
http://www.tx123.org/PublicViewBlog....createtime=531
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旧 Jul 7th, 2011, 21:51   只看该作者   #12
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81
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旧 Jul 7th, 2011, 22:38   只看该作者   #13
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Like 9÷3y
if y=(2+1)
then
9÷3y=9÷9=1
Wrong, 9÷3y=9÷3xy, so 9÷3x3=9

if you put "3y" in a pair of brackets, 9÷(3y), then 9÷(3x3)=9÷9=1
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旧 Jul 8th, 2011, 09:09   只看该作者   #14
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我的计算器上显示等于1。 SHARP EL-531W 型计算器。
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旧 Jul 9th, 2011, 19:16   只看该作者   #15
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这里有篇类似的讨论,看来还真是众说纷纭
http://knowyourmeme.com/memes/48293
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旧 Nov 23rd, 2011, 18:32   只看该作者   #16
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默认

来教教你们这些没有读过大学数学的人。joke...

呵呵,事实上出这个问题的人很无趣,因为在数学上,实数是个域,域操作符只有2个,一个是乘法一个是加法,所以除法根本不存在,所谓除法是乘法环上的补数而已,所以正确的写法比如 10÷ 5应该写成 10 * 5^-1
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