紧急求助一道连题目都看不懂的数学题

gzorchid · 发表于 2012-2-27 20:23:23

For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign fo the sequence 1,-3,2,5,-4,-6
A One
B Two
C Three
D Four
E Five
（答案是C)
题目是什么意思呢？计算过程是怎样的呢？

兲愛de狼 · 发表于 2012-2-27 20:27:37

就是问你这行数相邻两项乘积是负的有几个（1*-3）（-3*2) (5*-4)
3个

gzorchid · 发表于 2012-2-27 20:39:46

哦哦，非常感谢！！！！终于明白了~

紧急求助一道连题目都看不懂的数学题

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