JJ 629-302!

bbfcsak

629-320
14个连续整数问求和是否大于0

1.有七个正数

2.有-7这个数

选A

对，A

1)因为最小的和是从-6+-5。。。+-1+0 + 1+。。+ 7总共14个，结果是=7，所以肯定大于0

2)不行，只有一个更不能确定







I think is D, because if -7 is in the set, so the largest sum is from -7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6. So it must be less than 0.
and if -7 isn't the smallest number of the set, the sum defenit less than 0 too.

Sorry I can't type Chinese with the campus PC.

jeena

那么负8开始的话也是正的吗？负7在那个数列里，没说是最小的！

bbfcsak

If -7 is not the smallest so the set must <0 too.
for example, -8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5 must <0!

superfans124

同意LZ

wyw1018

对的应该选d

bbfcsak

版主看看啊~要改下啊~我刚下的WORD还没改呢！

casperbunny

我改去，你能不能把所有的错题发短信给我，我找了你3个帖子，还有吗，多谢阿，