幾個不等于0的有理數(shù)相乘,它們的積的符號如何確定________.
當負因數(shù)有奇數(shù)個數(shù),積為負;當負因數(shù)的個數(shù)為偶數(shù)個時,積為正
分析:根據(jù)有理數(shù)的乘法法則:幾個不等于零的數(shù)相乘,積的符號由負因數(shù)的個數(shù)決定:當負因數(shù)有奇數(shù)個數(shù),積為負;當負因數(shù)的個數(shù)為偶數(shù)個時,積為正.
解答:幾個不等于零的數(shù)相乘,積的符號由負因數(shù)的個數(shù)決定:當負因數(shù)有奇數(shù)個數(shù),積為負;當負因數(shù)的個數(shù)為偶數(shù)個時,積為正.
故答案為:當負因數(shù)有奇數(shù)個數(shù),積為負;當負因數(shù)的個數(shù)為偶數(shù)個時,積為正.
點評:幾個不等于零的數(shù)相乘,積的符號由負因數(shù)的個數(shù)決定:當負因數(shù)有奇數(shù)個數(shù),積為負;當負因數(shù)的個數(shù)為偶數(shù)個時,積為正.