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S is a finite set of numbers. Does S contain more negative numbers than positive numbers?
(1) The product of all the numbers in S is -1,200.
(2) There are 6 numbers in S .
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
1)总和是负数,那么这列数中一定有负数,但不能决定负数和正数的数量
2)一共有6个数,显然不能推出正数和负数的数量
1)+2)不能求出具体的数量,有可能负数只有一个,但是值特别小,正数有5个,但都是比较小的正数,平均值也可能是-1200
小良冠二郎
product是乘積,天才
timyan
只要负数的个数是奇数就可以
Kath1230
为什么我会想象成第一个条件负数多呢,也可能只有一个负数,乘积也是负啊。。。。
Foca
这里的product是乘积的意思
默默
没告诉值的范围
CD-cj
在第一个条件里面是所有的数的乘积而不是总和吧,这样的话就能判断出负数的个数大于正数的个数
lgw1486260873回复CD-cj
我也是这么考虑的,认为第一个是可以的
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2017-02-15 16:09:20
Naomi回复CD-cj
我也是这么认为的,错在哪里啊
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2017-05-09 13:28:11
Tmacyhr回复CD-cj
也有可能 只有一个负数 其他都为正数 乘积也为负 所以是无法判断的
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2017-07-07 22:51:27
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