JJ54!

bbfcsak · 发表于 2011-9-8 22:38:04

54-?
.已知0<a<b<c，abc是连续的，问下列哪个是负偶数？
有b-a，-a+c，还有（-a-c）/2，最后一个是谁也不是，果断选谁也不是

参考答案：选谁也不是

set:a=1,b=2,c=3.

So (-a-c)/2=(-1-3)/2=-2..

So the answer should be （-a-c）/2!

lywcd2011 · 发表于 2011-9-8 22:45:18

这么着算还是选（-a-c）/2 啊~。~我带了好几组数进去，应该没有特例了吧

bbfcsak · 发表于 2011-9-8 22:48:24

yes~the sum of two odd divide by two is 偶数~
at the same time, the sum of two 偶数 divide by 2 is also 偶数.
Because -a-c=-(a+c). So the answer is negative 偶数!

Stupid university desktop can't type Chinese..

chasingM7 · 发表于 2011-9-8 22:55:13

a= 2, b=3, c=4

-a-c=-2-4=-6

-6/2 = -3

none!

bbfcsak · 发表于 2011-9-8 22:56:53

a= 2, b=3, c=4

-a-c=-2-4=-6

-6/2 = -3

none!

-- by 会员 chasingM7 (2011/9/8 22:55:13)

Oh yeah!!! I got it...Thanks!

lp1203 · 发表于 2011-9-8 23:01:17

at the same time, the sum of two 偶数 divide by 2 is also 偶数

这个可不一定啊
取2，3，4
2+4=6
6/2=3

lp1203 · 发表于 2011-9-8 23:03:04

没看到前面已经回复了

casperbunny · 发表于 2011-9-8 23:08:45

Because -a-c=-(a+c). So the answer is negative 偶数! but you ignore that the sum of 2 odd divided by 2 is odd.
兄弟，不要吓我，数学改得我已经快吐了

bbfcsak · 发表于 2011-9-8 23:10:09

Sorry...stupid mistake....
Sorry for your time...

casperbunny · 发表于 2011-9-8 23:13:26

欢迎质疑

尤其是高水准的质疑只是整理稿原始稿，复习，于是我真的有点累了

JJ54!

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