Descartes'rule of signs-有句话看不懂
问题描述：
Descartes'rule of signs-有句话看不懂
Descartes'rule of signs-The number of positive real zeros of a polynomial P(x) either is equal to the number of variations in the sign between terms or is less than that number by an even integer.The number of negative real zeros of P(x）either is equal to the number of variations of the sign between the terms of P(-x) or is less than that number by an even integer 请问下这个.Or is less than that number by an even integer是什么意思啊
答
小2的倍数.即差值为偶数